Do not do chdir

finalcif/appwindow.py

@@ -12,6 +12,7 @@
 from datetime import datetime
 from math import sin, radians
 from pathlib import Path, WindowsPath
+from shutil import which
 from typing import Union, Dict, Tuple, List, Optional
 
 import gemmi.cif
@@ -1009,7 +1010,7 @@ def do_offline_checkcif(self) -> None:
                               log_widget=self.ui.CheckCifLogPlainTextEdit,
                               output_widget=self.ui.CheckcifPlaintextEdit,
                               cif_file=self.cif.fileobj)
-        if not Path(runner.platon_exe).resolve().exists():
+        if not Path(which(runner.platon_exe)).exists():
             self.ui.CheckCifLogPlainTextEdit.setPlainText('\nPlaton executable not found!')
             self.ui.CheckCifLogPlainTextEdit.appendPlainText('You can download Platon at http://www.platonsoft.nl/platon/\n')
         runner.tick.connect(self.append_to_ciflog_without_newline)

finalcif/tools/process.py

@@ -30,20 +30,21 @@ def __init__(self, parent, output_widget: QPlainTextEdit, log_widget: QPlainText
 
     def run_process(self):
         self._origdir = os.curdir
-        os.chdir(self.cif_file.parent)
+        #os.chdir(self.cif_file.parent)
         self.formula_moiety = ''
         self.Z = ''
         self.process = QProcess()
         self.output_widget.clear()
         threading.Thread(target=self._monitor_output_log).start()
         # self.process.readyReadStandardOutput.connect(self.on_ready_read)
         self.process.finished.connect(self._onfinished)
+        self.process.setWorkingDirectory(str(self.cif_file.parent))
         self.cif_file.with_suffix('.chk').unlink(missing_ok=True)
         self.process.start(self.platon_exe, ["-U", str(self.cif_file.name)])
 
     def _onfinished(self):
         self._on_ready_read()
-        os.chdir(self._origdir)
+        #os.chdir(self._origdir)
         self._parse_chk_file()
         self.output_widget.setPlainText(self.chk_file_text)
         self.finished.emit(True)