diff --git a/examples/Notebooks/flopy3.3_PlotCrossSection.ipynb b/examples/Notebooks/flopy3.3_PlotCrossSection.ipynb
index 391d87f6de..2f3e8c7c48 100644
--- a/examples/Notebooks/flopy3.3_PlotCrossSection.ipynb
+++ b/examples/Notebooks/flopy3.3_PlotCrossSection.ipynb
@@ -45,7 +45,6 @@
    "source": [
     "import sys\n",
     "import os\n",
-    "import platform\n",
     "import numpy as np\n",
     "import matplotlib as mpl\n",
     "import matplotlib.pyplot as plt\n",
@@ -90,11 +89,6 @@
     "exe_name_2005 = \"mf2005\"\n",
     "vmf6 = \"mf6\"\n",
     "exe_name_mf6 = \"mf6\"\n",
-    "exe_mp = \"mp6\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    exe_name_2005 += \".exe\"\n",
-    "    exe_name_mf6 += \".exe\"\n",
-    "    exe_mp += \".exe\"\n",
     "\n",
     "# Set the paths\n",
     "prj_root = notebook_utils.get_project_root_path()\n",
diff --git a/examples/Notebooks/flopy3.3_PlotMapView.ipynb b/examples/Notebooks/flopy3.3_PlotMapView.ipynb
index 9b53692ddd..425c9046c9 100644
--- a/examples/Notebooks/flopy3.3_PlotMapView.ipynb
+++ b/examples/Notebooks/flopy3.3_PlotMapView.ipynb
@@ -45,7 +45,6 @@
    "source": [
     "import sys\n",
     "import os\n",
-    "import platform\n",
     "import numpy as np\n",
     "import matplotlib as mpl\n",
     "import matplotlib.pyplot as plt\n",
@@ -92,11 +91,6 @@
     "vmf6 = \"mf6\"\n",
     "exe_name_mf6 = \"mf6\"\n",
     "exe_mp = \"mp6\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    exe_name_2005 += \".exe\"\n",
-    "    exe_name_mf6 += \".exe\"\n",
-    "    exe_mp += \".exe\"\n",
-    "\n",
     "\n",
     "# Set the paths\n",
     "prj_root = notebook_utils.get_project_root_path()\n",
diff --git a/examples/Notebooks/flopy3_MT3D-USGS_example.ipynb b/examples/Notebooks/flopy3_MT3D-USGS_example.ipynb
index 56f227aaf5..78b4a7f1f0 100644
--- a/examples/Notebooks/flopy3_MT3D-USGS_example.ipynb
+++ b/examples/Notebooks/flopy3_MT3D-USGS_example.ipynb
@@ -46,7 +46,6 @@
    "source": [
     "import sys\n",
     "import os\n",
-    "import platform\n",
     "import string\n",
     "from tempfile import TemporaryDirectory\n",
     "from io import StringIO, BytesIO\n",
@@ -88,9 +87,6 @@
     "modelname = \"CrnkNic\"\n",
     "mfexe = \"mfnwt\"\n",
     "mtexe = \"mt3dusgs\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    mfexe += \".exe\"\n",
-    "    mtexe += \".exe\"\n",
     "\n",
     "# Make sure modelpth directory exists\n",
     "if not os.path.isdir(modelpth):\n",
diff --git a/examples/Notebooks/flopy3_PlotArrayExample.ipynb b/examples/Notebooks/flopy3_PlotArrayExample.ipynb
index 3460c5510a..588a88ae70 100644
--- a/examples/Notebooks/flopy3_PlotArrayExample.ipynb
+++ b/examples/Notebooks/flopy3_PlotArrayExample.ipynb
@@ -38,7 +38,6 @@
     "from IPython.display import Image\n",
     "import sys\n",
     "import os\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
@@ -76,9 +75,6 @@
     "#  assumes executable is in users path statement\n",
     "version = \"mf2005\"\n",
     "exe_name = \"mf2005\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    exe_name = \"mf2005.exe\"\n",
-    "mfexe = exe_name\n",
     "\n",
     "# Set the paths\n",
     "loadpth = os.path.join(\"..\", \"data\", \"secp\")\n",
diff --git a/examples/Notebooks/flopy3_WatertableRecharge_example.ipynb b/examples/Notebooks/flopy3_WatertableRecharge_example.ipynb
index 2bf1efced7..2b8b8f6d76 100644
--- a/examples/Notebooks/flopy3_WatertableRecharge_example.ipynb
+++ b/examples/Notebooks/flopy3_WatertableRecharge_example.ipynb
@@ -50,7 +50,6 @@
    "source": [
     "import os\n",
     "import sys\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
diff --git a/examples/Notebooks/flopy3_Zaidel_example.ipynb b/examples/Notebooks/flopy3_Zaidel_example.ipynb
index ece7e77439..72b397afb8 100644
--- a/examples/Notebooks/flopy3_Zaidel_example.ipynb
+++ b/examples/Notebooks/flopy3_Zaidel_example.ipynb
@@ -43,7 +43,6 @@
    "source": [
     "import os\n",
     "import sys\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
@@ -79,10 +78,7 @@
    "source": [
     "# Set name of MODFLOW exe\n",
     "#  assumes executable is in users path statement\n",
-    "exe_name = \"mfusg\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    exe_name += \".exe\"\n",
-    "mfexe = exe_name\n",
+    "mfexe = \"mfusg\"\n",
     "\n",
     "modelname = \"zaidel\"\n",
     "temp_dir = TemporaryDirectory()\n",
diff --git a/examples/Notebooks/flopy3_ZoneBudget_example.ipynb b/examples/Notebooks/flopy3_ZoneBudget_example.ipynb
index 800a9e015a..71e4215043 100644
--- a/examples/Notebooks/flopy3_ZoneBudget_example.ipynb
+++ b/examples/Notebooks/flopy3_ZoneBudget_example.ipynb
@@ -40,7 +40,6 @@
    "source": [
     "import os\n",
     "import sys\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
@@ -1635,9 +1634,6 @@
    "source": [
     "mf6_exe = \"mf6\"\n",
     "zb6_exe = \"zbud6\"\n",
-    "if platform.system().lower() == \"windows\":\n",
-    "    mf6_exe += \".exe\"\n",
-    "    zb6_exe += \".exe\"\n",
     "\n",
     "sim_ws = os.path.join(\"..\", \"data\", \"mf6-freyberg\")\n",
     "cpth = os.path.join(\".\", \"temp\")\n",
diff --git a/examples/Notebooks/flopy3_array_outputformat_options.ipynb b/examples/Notebooks/flopy3_array_outputformat_options.ipynb
index 484139abbd..b8f581d38d 100644
--- a/examples/Notebooks/flopy3_array_outputformat_options.ipynb
+++ b/examples/Notebooks/flopy3_array_outputformat_options.ipynb
@@ -53,7 +53,6 @@
    "source": [
     "import sys\n",
     "import os\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
diff --git a/examples/Notebooks/flopy3_demo_of_modelgrid_classes.ipynb b/examples/Notebooks/flopy3_demo_of_modelgrid_classes.ipynb
index 63d76e50f8..7372d7204f 100644
--- a/examples/Notebooks/flopy3_demo_of_modelgrid_classes.ipynb
+++ b/examples/Notebooks/flopy3_demo_of_modelgrid_classes.ipynb
@@ -50,7 +50,6 @@
     "import numpy as np\n",
     "import matplotlib as mpl\n",
     "import matplotlib.pyplot as plt\n",
-    "import platform\n",
     "\n",
     "# run installed version of flopy or add local path\n",
     "try:\n",
@@ -85,10 +84,7 @@
     "# set the names of our modflow executables\n",
     "# assumes that the executable is in users path statement\n",
     "mf6_exe = \"mf6\"\n",
-    "gridgen_exe = \"gridgen\"\n",
-    "if platform.system().lower() == \"windows\":\n",
-    "    mf6_exe += \".exe\"\n",
-    "    gridgen_exe += \".exe\""
+    "gridgen_exe = \"gridgen\""
    ]
   },
   {
diff --git a/examples/Notebooks/flopy3_grid_intersection_demo.ipynb b/examples/Notebooks/flopy3_grid_intersection_demo.ipynb
index 87ae6116e8..fb765ca6c2 100644
--- a/examples/Notebooks/flopy3_grid_intersection_demo.ipynb
+++ b/examples/Notebooks/flopy3_grid_intersection_demo.ipynb
@@ -63,7 +63,6 @@
    ],
    "source": [
     "import os\n",
-    "import platform\n",
     "import sys\n",
     "\n",
     "import matplotlib as mpl\n",
diff --git a/examples/Notebooks/flopy3_gridgen.ipynb b/examples/Notebooks/flopy3_gridgen.ipynb
index ee4924efaf..1b905b4236 100644
--- a/examples/Notebooks/flopy3_gridgen.ipynb
+++ b/examples/Notebooks/flopy3_gridgen.ipynb
@@ -37,7 +37,6 @@
    "source": [
     "import os\n",
     "import sys\n",
-    "import platform\n",
     "import shutil\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
@@ -89,10 +88,6 @@
     }
    ],
    "source": [
-    "gridgen_exe = \"gridgen\"\n",
-    "if platform.system() in \"Windows\":\n",
-    "    gridgen_exe += \".exe\"\n",
-    "\n",
     "gridgen_exe = flopy.which(\"gridgen\")\n",
     "if gridgen_exe is None:\n",
     "    msg = (\n",
diff --git a/examples/Notebooks/flopy3_mf6_A_simple-model.ipynb b/examples/Notebooks/flopy3_mf6_A_simple-model.ipynb
index 23d502c2a9..d49248cae5 100644
--- a/examples/Notebooks/flopy3_mf6_A_simple-model.ipynb
+++ b/examples/Notebooks/flopy3_mf6_A_simple-model.ipynb
@@ -44,7 +44,6 @@
    "source": [
     "import sys\n",
     "import os\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
diff --git a/examples/Notebooks/flopy3_mf6_B_complex-model.ipynb b/examples/Notebooks/flopy3_mf6_B_complex-model.ipynb
index 288d766566..574190e226 100644
--- a/examples/Notebooks/flopy3_mf6_B_complex-model.ipynb
+++ b/examples/Notebooks/flopy3_mf6_B_complex-model.ipynb
@@ -44,7 +44,6 @@
    "source": [
     "import sys\n",
     "import os\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
diff --git a/examples/Notebooks/flopy3_mf6_tutorial.ipynb b/examples/Notebooks/flopy3_mf6_tutorial.ipynb
index 4741f666f9..8dfe17ca3d 100644
--- a/examples/Notebooks/flopy3_mf6_tutorial.ipynb
+++ b/examples/Notebooks/flopy3_mf6_tutorial.ipynb
@@ -92,7 +92,7 @@
     "\n",
     "version='mf6'\n",
     "\n",
-    "exe_name='mf6.exe'\n",
+    "exe_name='mf6'\n",
     "\n",
     "sim_ws='.'\n",
     "\n",
diff --git a/examples/Notebooks/flopy3_modpath7_create_simulation.ipynb b/examples/Notebooks/flopy3_modpath7_create_simulation.ipynb
index 0e60769deb..9da6713925 100644
--- a/examples/Notebooks/flopy3_modpath7_create_simulation.ipynb
+++ b/examples/Notebooks/flopy3_modpath7_create_simulation.ipynb
@@ -42,7 +42,6 @@
     "import numpy as np\n",
     "import matplotlib as mpl\n",
     "import matplotlib.pyplot as plt\n",
-    "import platform\n",
     "\n",
     "# run installed version of flopy or add local path\n",
     "try:\n",
@@ -77,10 +76,7 @@
    "source": [
     "# define executable names\n",
     "mpexe = \"mp7\"\n",
-    "mfexe = \"mf6\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    mpexe += \".exe\"\n",
-    "    mfexe += \".exe\""
+    "mfexe = \"mf6\""
    ]
   },
   {
diff --git a/examples/Notebooks/flopy3_mt3d-usgs_example_with_sft_lkt_uzt.ipynb b/examples/Notebooks/flopy3_mt3d-usgs_example_with_sft_lkt_uzt.ipynb
index f3ded2e146..afbe73e0f4 100644
--- a/examples/Notebooks/flopy3_mt3d-usgs_example_with_sft_lkt_uzt.ipynb
+++ b/examples/Notebooks/flopy3_mt3d-usgs_example_with_sft_lkt_uzt.ipynb
@@ -42,7 +42,6 @@
    "source": [
     "import os\n",
     "import sys\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
@@ -97,10 +96,6 @@
     "mfexe = \"mfnwt\"\n",
     "mtexe = \"mt3dusgs\"\n",
     "\n",
-    "if platform.system() == \"Windows\":\n",
-    "    mfexe += \".exe\"\n",
-    "    mtexe += \".exe\"\n",
-    "\n",
     "# Make sure modelpth directory exists\n",
     "if not os.path.isdir(modelpth):\n",
     "    os.makedirs(modelpth, exist_ok=True)\n",
diff --git a/examples/Notebooks/flopy3_nwt_options.ipynb b/examples/Notebooks/flopy3_nwt_options.ipynb
index b158e1078d..018acf700b 100644
--- a/examples/Notebooks/flopy3_nwt_options.ipynb
+++ b/examples/Notebooks/flopy3_nwt_options.ipynb
@@ -35,7 +35,6 @@
    "source": [
     "import os\n",
     "import sys\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "try:\n",
@@ -121,9 +120,6 @@
    "source": [
     "mfexe = \"mfnwt\"\n",
     "\n",
-    "if platform.system() == \"Windows\":\n",
-    "    mfexe += \".exe\"\n",
-    "\n",
     "ml = flopy.modflow.Modflow.load(\n",
     "    \"sagehen.nam\", model_ws=load_ws, exe_name=mfexe, version=\"mfnwt\"\n",
     ")\n",
diff --git a/examples/Notebooks/flopy3_sfrpackage_example.ipynb b/examples/Notebooks/flopy3_sfrpackage_example.ipynb
index cbd4efe24c..6eef01c401 100644
--- a/examples/Notebooks/flopy3_sfrpackage_example.ipynb
+++ b/examples/Notebooks/flopy3_sfrpackage_example.ipynb
@@ -44,7 +44,6 @@
    ],
    "source": [
     "import sys\n",
-    "import platform\n",
     "import os\n",
     "import glob\n",
     "import shutil\n",
@@ -90,9 +89,7 @@
    "source": [
     "# Set name of MODFLOW exe\n",
     "#  assumes executable is in users path statement\n",
-    "exe_name = \"mf2005\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    exe_name += \".exe\""
+    "exe_name = \"mf2005\""
    ]
   },
   {
diff --git a/examples/Notebooks/flopy3_swi2package_ex1.ipynb b/examples/Notebooks/flopy3_swi2package_ex1.ipynb
index b55c8100ff..e03ab7de1f 100644
--- a/examples/Notebooks/flopy3_swi2package_ex1.ipynb
+++ b/examples/Notebooks/flopy3_swi2package_ex1.ipynb
@@ -49,7 +49,6 @@
    "source": [
     "import os\n",
     "import sys\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
@@ -95,8 +94,6 @@
     "# Set name of MODFLOW exe\n",
     "#  assumes executable is in users path statement\n",
     "exe_name = \"mf2005\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    exe_name = \"mf2005.exe\"\n",
     "\n",
     "temp_dir = TemporaryDirectory()\n",
     "workspace = temp_dir.name\n",
diff --git a/examples/Notebooks/flopy3_swi2package_ex4.ipynb b/examples/Notebooks/flopy3_swi2package_ex4.ipynb
index ba626663dd..81101fbc82 100644
--- a/examples/Notebooks/flopy3_swi2package_ex4.ipynb
+++ b/examples/Notebooks/flopy3_swi2package_ex4.ipynb
@@ -54,7 +54,6 @@
    "source": [
     "import os\n",
     "import sys\n",
-    "import platform\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
     "import numpy as np\n",
@@ -98,8 +97,6 @@
     "# Set name of MODFLOW exe\n",
     "#  assumes executable is in users path statement\n",
     "exe_name = \"mf2005\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    exe_name = \"mf2005.exe\"\n",
     "\n",
     "temp_dir = TemporaryDirectory()\n",
     "workspace = temp_dir.name"
diff --git a/examples/Notebooks/flopy3_uzf_example.ipynb b/examples/Notebooks/flopy3_uzf_example.ipynb
index 1a61103c28..78eb80c551 100644
--- a/examples/Notebooks/flopy3_uzf_example.ipynb
+++ b/examples/Notebooks/flopy3_uzf_example.ipynb
@@ -49,7 +49,6 @@
     "import os\n",
     "import sys\n",
     "import glob\n",
-    "import platform\n",
     "import shutil\n",
     "from tempfile import TemporaryDirectory\n",
     "\n",
@@ -88,9 +87,7 @@
    "source": [
     "# Set name of MODFLOW exe\n",
     "#  assumes executable is in users path statement\n",
-    "exe_name = \"mf2005\"\n",
-    "if platform.system() == \"Windows\":\n",
-    "    exe_name += \".exe\""
+    "exe_name = \"mf2005\""
    ]
   },
   {
diff --git a/examples/Tutorials/modflow6output/tutorial01_mf6_output.py b/examples/Tutorials/modflow6output/tutorial01_mf6_output.py
index f811e531e2..70395b1a43 100644
--- a/examples/Tutorials/modflow6output/tutorial01_mf6_output.py
+++ b/examples/Tutorials/modflow6output/tutorial01_mf6_output.py
@@ -19,7 +19,6 @@
 # package object
 
 import os
-import platform
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
@@ -31,8 +30,6 @@
 # ## Load a simple demonstration model
 
 exe_name = "mf6"
-if platform.system().lower() == "windows":
-    exe_name += ".exe"
 
 
 def get_project_root_path(path=None):
diff --git a/examples/scripts/flopy_swi2_ex4.py b/examples/scripts/flopy_swi2_ex4.py
index c221867b8f..7822337428 100644
--- a/examples/scripts/flopy_swi2_ex4.py
+++ b/examples/scripts/flopy_swi2_ex4.py
@@ -1,5 +1,4 @@
 import os
-import platform
 import sys
 from tempfile import TemporaryDirectory
 
@@ -67,8 +66,6 @@ def run(workspace, quiet):
 
     # Set path and name of MODFLOW exe
     exe_name = "mf2005"
-    if platform.system() == "Windows":
-        exe_name = "mf2005"
 
     ncol = 61
     nrow = 61
diff --git a/flopy/mbase.py b/flopy/mbase.py
index f4807d5904..0e3743c86d 100644
--- a/flopy/mbase.py
+++ b/flopy/mbase.py
@@ -302,7 +302,7 @@ class BaseModel(ModelInterface):
         Name of the model, which is also used for model file names.
     namefile_ext : str, default "nam"
         Name file extension, without "."
-    exe_name : str, default "mf2k.exe"
+    exe_name : str, default "mf2005"
         Name of the modflow executable.
     model_ws : str, optional
         Path to the model workspace.  Model files will be created in this
@@ -326,7 +326,7 @@ def __init__(
         self,
         modelname="modflowtest",
         namefile_ext="nam",
-        exe_name="mf2k.exe",
+        exe_name="mf2005",
         model_ws=None,
         structured=True,
         verbose=False,
@@ -1698,12 +1698,8 @@ def run_model(
     # Check to make sure that program and namefile exist
     exe = which(exe_name)
     if exe is None:
-        import platform
-
-        if platform.system() in "Windows":
-            if not exe_name.lower().endswith(".exe"):
-                exe = which(exe_name + ".exe")
-        elif exe_name.lower().endswith(".exe"):
+        if exe_name.lower().endswith(".exe"):
+            # try removing .exe suffix
             exe = which(exe_name[:-4])
     if exe is None:
         raise Exception(
diff --git a/flopy/mf6/mfmodel.py b/flopy/mf6/mfmodel.py
index f933c7f81b..3116da1b8c 100644
--- a/flopy/mf6/mfmodel.py
+++ b/flopy/mf6/mfmodel.py
@@ -75,7 +75,7 @@ def __init__(
         modelname="model",
         model_nam_file=None,
         version="mf6",
-        exe_name="mf6.exe",
+        exe_name="mf6",
         add_to_simulation=True,
         structure=None,
         model_rel_path=".",
@@ -686,7 +686,7 @@ def load_base(
         model_nam_file="modflowtest.nam",
         mtype="gwf",
         version="mf6",
-        exe_name="mf6.exe",
+        exe_name="mf6",
         strict=True,
         model_rel_path=".",
         load_only=None,
@@ -865,7 +865,7 @@ def inspect_cells(
         --------
 
         >>> import flopy
-        >>> sim = flopy.mf6.MFSimulation.load("name", "mf6", "mf6.exe", ".")
+        >>> sim = flopy.mf6.MFSimulation.load("name", "mf6", "mf6", ".")
         >>> model = sim.get_model()
         >>> inspect_list = [(2, 3, 2), (0, 4, 2), (0, 2, 4)]
         >>> out_file = os.path.join("temp", "inspect_AdvGW_tidal.csv")
diff --git a/flopy/mf6/modflow/mfgwf.py b/flopy/mf6/modflow/mfgwf.py
index 72e0e2da2b..b94624ef48 100644
--- a/flopy/mf6/modflow/mfgwf.py
+++ b/flopy/mf6/modflow/mfgwf.py
@@ -83,7 +83,7 @@ def __init__(
         modelname="model",
         model_nam_file=None,
         version="mf6",
-        exe_name="mf6.exe",
+        exe_name="mf6",
         model_rel_path=".",
         list=None,
         print_input=None,
@@ -119,7 +119,7 @@ def load(
         modelname="NewModel",
         model_nam_file="modflowtest.nam",
         version="mf6",
-        exe_name="mf6.exe",
+        exe_name="mf6",
         strict=True,
         model_rel_path=".",
         load_only=None,
diff --git a/flopy/mf6/modflow/mfgwt.py b/flopy/mf6/modflow/mfgwt.py
index 22b02d6826..dfe3db2f98 100644
--- a/flopy/mf6/modflow/mfgwt.py
+++ b/flopy/mf6/modflow/mfgwt.py
@@ -78,7 +78,7 @@ def __init__(
         modelname="model",
         model_nam_file=None,
         version="mf6",
-        exe_name="mf6.exe",
+        exe_name="mf6",
         model_rel_path=".",
         list=None,
         print_input=None,
@@ -112,7 +112,7 @@ def load(
         modelname="NewModel",
         model_nam_file="modflowtest.nam",
         version="mf6",
-        exe_name="mf6.exe",
+        exe_name="mf6",
         strict=True,
         model_rel_path=".",
         load_only=None,
diff --git a/flopy/mf6/modflow/mfsimulation.py b/flopy/mf6/modflow/mfsimulation.py
index e8bacf0285..23dd78ac69 100644
--- a/flopy/mf6/modflow/mfsimulation.py
+++ b/flopy/mf6/modflow/mfsimulation.py
@@ -385,7 +385,7 @@ def __init__(
         self,
         sim_name="sim",
         version="mf6",
-        exe_name="mf6.exe",
+        exe_name="mf6",
         sim_ws=".",
         verbosity_level=1,
         continue_=None,
@@ -593,7 +593,7 @@ def load(
         cls,
         sim_name="modflowsim",
         version="mf6",
-        exe_name="mf6.exe",
+        exe_name="mf6",
         sim_ws=".",
         strict=True,
         verbosity_level=1,
diff --git a/flopy/mf6/utils/createpackages.py b/flopy/mf6/utils/createpackages.py
index b36864cb3a..b7ed4e5585 100644
--- a/flopy/mf6/utils/createpackages.py
+++ b/flopy/mf6/utils/createpackages.py
@@ -393,7 +393,7 @@ def build_model_load(model_type):
         "    @classmethod\n    def load(cls, simulation, structure, "
         "modelname='NewModel',\n             "
         "model_nam_file='modflowtest.nam', version='mf6',\n"
-        "             exe_name='mf6.exe', strict=True, "
+        "             exe_name='mf6', strict=True, "
         "model_rel_path='.',\n"
         "             load_only=None):\n        "
         "return mfmodel.MFModel.load_base(simulation, structure, "
@@ -860,7 +860,7 @@ def create_packages():
             init_vars = build_model_init_vars(model_param_list)
 
             model_param_list.insert(0, "model_rel_path='.'")
-            model_param_list.insert(0, "exe_name='mf6.exe'")
+            model_param_list.insert(0, "exe_name='mf6'")
             model_param_list.insert(0, "version='mf6'")
             model_param_list.insert(0, "model_nam_file=None")
             model_param_list.insert(0, "modelname='model'")
diff --git a/flopy/mfusg/mfusg.py b/flopy/mfusg/mfusg.py
index 4af40b7b90..a51aa75ba7 100644
--- a/flopy/mfusg/mfusg.py
+++ b/flopy/mfusg/mfusg.py
@@ -162,7 +162,7 @@ def load(
             Path to MODFLOW name file to load.
         version : str, default "mfusg"
             MODFLOW version. Must be "mfusg".
-        exe_name : str, default "mfusg.exe"
+        exe_name : str, default "mfusg"
             MODFLOW executable name.
         verbose : bool, default False
             Show messages that can be useful for debugging.
diff --git a/flopy/modflow/mf.py b/flopy/modflow/mf.py
index d8f574e729..92a601ff12 100644
--- a/flopy/modflow/mf.py
+++ b/flopy/modflow/mf.py
@@ -69,7 +69,7 @@ class Modflow(BaseModel):
     version : str, default "mf2005"
         MODFLOW version. Choose one of: "mf2k", "mf2005" (default),
         "mfnwt", or "mfusg".
-    exe_name : str, default "mf2005.exe"
+    exe_name : str, default "mf2005"
         The name of the executable to use.
     structured : bool, default True
         Specify if model grid is structured (default) or unstructured.
@@ -107,7 +107,7 @@ def __init__(
         modelname="modflowtest",
         namefile_ext="nam",
         version="mf2005",
-        exe_name="mf2005.exe",
+        exe_name="mf2005",
         structured=True,
         listunit=2,
         model_ws=".",
@@ -650,7 +650,7 @@ def load(
         cls,
         f,
         version="mf2005",
-        exe_name="mf2005.exe",
+        exe_name="mf2005",
         verbose=False,
         model_ws=".",
         load_only=None,
@@ -668,7 +668,7 @@ def load(
             MODFLOW version. Choose one of: "mf2k", "mf2005" (default),
             or "mfnwt". Note that this can be modified on loading
             packages unique to different MODFLOW versions.
-        exe_name : str, default "mf2005.exe"
+        exe_name : str, default "mf2005"
             MODFLOW executable name.
         verbose : bool, default False
             Show messages that can be useful for debugging.
diff --git a/flopy/modflowlgr/mflgr.py b/flopy/modflowlgr/mflgr.py
index 2d4dd24c70..3313b61ed4 100644
--- a/flopy/modflowlgr/mflgr.py
+++ b/flopy/modflowlgr/mflgr.py
@@ -69,7 +69,7 @@ class ModflowLgr(BaseModel):
         Extension for the namefile.
     version : str, default "mflgr".
         Version of MODFLOW-LGR to use.
-    exe_name : str, default "mflgr.exe"
+    exe_name : str, default "mflgr"
         The name of the executable to use.
     iupbhsv : int, default 0
         Unit number with boundary heads.
@@ -114,7 +114,7 @@ def __init__(
         modelname="modflowlgrtest",
         namefile_ext="lgr",
         version="mflgr",
-        exe_name="mflgr.exe",
+        exe_name="mflgr",
         iupbhsv=0,
         iupbfsv=0,
         parent=None,
@@ -466,7 +466,7 @@ def load(
         cls,
         f,
         version="mflgr",
-        exe_name="mflgr.exe",
+        exe_name="mflgr",
         verbose=False,
         model_ws=".",
         load_only=None,
@@ -482,7 +482,7 @@ def load(
             Path to MODFLOW-LGR name file to load.
         version : str, default "mflgr".
             Version of MODFLOW-LGR to use.
-        exe_name : str, default "mflgr.exe"
+        exe_name : str, default "mflgr"
             The name of the executable to use.
         verbose : bool, default False
             Print additional information to the screen.
diff --git a/flopy/modpath/mp6.py b/flopy/modpath/mp6.py
index fa648ffbea..69960c8c90 100644
--- a/flopy/modpath/mp6.py
+++ b/flopy/modpath/mp6.py
@@ -39,7 +39,7 @@ class Modpath6(BaseModel):
     version : str, default "modpath"
         String that defines the MODPATH version. Valid versions are
         "modpath" (default).
-    exe_name : str, default "mp6.exe"
+    exe_name : str, default "mp6"
         The name of the executable to use.
     modflowmodel : flopy.modflow.Modflow
         MODFLOW model object with one of LPF, BCF6, or UPW packages.
@@ -71,7 +71,7 @@ def __init__(
         simfile_ext="mpsim",
         namefile_ext="mpnam",
         version="modpath",
-        exe_name="mp6.exe",
+        exe_name="mp6",
         modflowmodel=None,
         dis_file=None,
         dis_unit=87,
diff --git a/flopy/modpath/mp7.py b/flopy/modpath/mp7.py
index 63c0e159b9..464649652f 100644
--- a/flopy/modpath/mp7.py
+++ b/flopy/modpath/mp7.py
@@ -53,7 +53,7 @@ class Modpath7(BaseModel):
     version : str, default "modpath7"
         String that defines the MODPATH version. Valid versions are
         "modpath7" (default).
-    exe_name : str, default "mp7.exe"
+    exe_name : str, default "mp7"
         The name of the executable to use.
     flowmodel : flopy.modflow.Modflow or flopy.mf6.MFModel object
         MODFLOW model object.
@@ -84,7 +84,7 @@ def __init__(
         simfile_ext="mpsim",
         namefile_ext="mpnam",
         version="modpath7",
-        exe_name="mp7.exe",
+        exe_name="mp7",
         flowmodel=None,
         headfilename=None,
         budgetfilename=None,