diff --git a/package.json b/package.json
index 6898d9aa0cc..caa8fbfcbec 100644
--- a/package.json
+++ b/package.json
@@ -54,6 +54,7 @@
   "homepage": "https://github.com/electron-userland/electron-builder",
   "dependencies": {
     "7zip-bin": "^0.0.4",
+    "asar": "^0.11.0",
     "bluebird": "^3.3.5",
     "chalk": "^1.1.3",
     "command-line-args": "^2.1.6",
diff --git a/src/metadata.ts b/src/metadata.ts
index 5f90454249a..d51b5257487 100755
--- a/src/metadata.ts
+++ b/src/metadata.ts
@@ -24,6 +24,8 @@ export interface AppMetadata extends Metadata {
    */
   readonly description: string
 
+  readonly main?: string
+
   readonly author: AuthorMetadata
 
   /*
diff --git a/src/platformPackager.ts b/src/platformPackager.ts
index 5dfebfa0143..84906279594 100644
--- a/src/platformPackager.ts
+++ b/src/platformPackager.ts
@@ -15,6 +15,8 @@ const __awaiter = require("./awaiter")
 
 const pack = BluebirdPromise.promisify(packager)
 
+const asar = require("asar")
+
 export interface PackagerOptions {
   arch?: string
 
@@ -155,14 +157,7 @@ export abstract class PlatformPackager<DC extends PlatformSpecificBuildOptions>
 
     this.beforePack(options)
     await pack(options)
-
-    const outStat = await statOrNull(appOutDir)
-    if (outStat == null) {
-      throw new Error(`Output directory ${appOutDir} does not exists. Seems like a wrong configuration.`)
-    }
-    else if (!outStat.isDirectory()) {
-      throw new Error(`Output directory ${appOutDir} is not a directory. Seems like a wrong configuration.`)
-    }
+    await this.sanityCheckPackage(appOutDir, options.asar)
   }
 
   protected getExtraResources(arch: string): Promise<Array<string>> {
@@ -187,7 +182,7 @@ export abstract class PlatformPackager<DC extends PlatformSpecificBuildOptions>
   protected async copyExtraResources(appOutDir: string, arch: string): Promise<Array<string>> {
     let resourcesDir = appOutDir
     if (this.platform === Platform.OSX) {
-      resourcesDir = path.join(resourcesDir, this.appName + ".app", "Contents", "Resources")
+      resourcesDir = this.getOSXResourcesDir(appOutDir)
     }
     return await BluebirdPromise.map(await this.getExtraResources(arch), it => copy(path.join(this.projectDir, it), path.join(resourcesDir, it)))
   }
@@ -212,6 +207,39 @@ export abstract class PlatformPackager<DC extends PlatformSpecificBuildOptions>
   protected computeBuildNumber(): string {
     return this.devMetadata.build["build-version"] || process.env.TRAVIS_BUILD_NUMBER || process.env.APPVEYOR_BUILD_NUMBER || process.env.CIRCLE_BUILD_NUM
   }
+
+  private getOSXResourcesDir(appOutDir: string): string {
+    return path.join(appOutDir, this.appName + ".app", "Contents", "Resources")
+  }
+
+  private async statPackageFile(appOutDir: string, packageFile: string, isAsar: boolean): Promise<any> {
+    const fpath = path.resolve("/", packageFile)
+    const resourcesDir = this.platform === Platform.OSX ? this.getOSXResourcesDir(appOutDir) : path.join(appOutDir, "resources")
+    if (isAsar) {
+      const appPackage = path.join(resourcesDir, "app.asar")
+      return asar.listPackage(appPackage).indexOf(fpath) !== -1
+    } else {
+      const outStat = await statOrNull(path.join(resourcesDir, fpath))
+      return outStat != null && outStat.isFile()
+    }
+  }
+
+  private async sanityCheckPackage(appOutDir: string, asar: boolean): Promise<any> {
+    const outStat = await statOrNull(appOutDir)
+    if (outStat == null) {
+      throw new Error(`Output directory ${appOutDir} does not exists. Seems like a wrong configuration.`)
+    }
+    else if (!outStat.isDirectory()) {
+      throw new Error(`Output directory ${appOutDir} is not a directory. Seems like a wrong configuration.`)
+    }
+
+    const main = this.metadata.main || "index.js"
+    const mainExists = await this.statPackageFile(appOutDir, main, asar)
+    if (!mainExists) {
+      throw new Error(`Application entry file ` + main + ` could not be found in package. Seems like a wrong configuration.`)
+    }
+  }
+
 }
 
 function checkConflictingOptions(options: any) {
diff --git a/test/src/BuildTest.ts b/test/src/BuildTest.ts
index 84153cf946d..4fa46107893 100755
--- a/test/src/BuildTest.ts
+++ b/test/src/BuildTest.ts
@@ -45,6 +45,31 @@ test("build in the app package.json", t => t.throws(assertPack("test-app", allPl
   }, true)
 }), /'build' in the application package\.json .+/))
 
+test("invalid main in the app package.json", t => t.throws(assertPack("test-app", {
+  platform: [Platform.fromString(process.platform)],
+  dist: true
+}, {
+  tempDirCreated: projectDir => modifyPackageJson(projectDir, data => {
+    data.main = "main.js"
+  }, true)
+}), /Application entry file main.js could not be found in package+/))
+
+test("invalid main in the app package.json (no asar)", t => t.throws(assertPack("test-app", {
+  platform: [Platform.fromString(process.platform)],
+  dist: true
+}, {
+  tempDirCreated: projectDir => {
+    return BluebirdPromise.all([
+      modifyPackageJson(projectDir, data => {
+        data.main = "main.js"
+      }, true),
+      modifyPackageJson(projectDir, data => {
+        data.build.asar = false
+      })
+    ])
+  }
+}), /Application entry file main.js could not be found in package+/))
+
 test("version from electron-prebuilt dependency", () => assertPack("test-app-one", {
   platform: [Platform.fromString(process.platform)],
   dist: false