diff --git a/electron/main/utils/process.ts b/electron/main/utils/process.ts
index e91986d5..d5cd6802 100644
--- a/electron/main/utils/process.ts
+++ b/electron/main/utils/process.ts
@@ -168,6 +168,7 @@ function fixPyvenvCfgPlaceholder(pyvenvCfgPath: string): boolean {
       }
 
       // Replace placeholder with actual path
+      // On Windows, path.join returns paths with backslashes, which matches our placeholder format
       content = content.replace(/\{\{PREBUILT_PYTHON_DIR\}\}/g, prebuiltPythonDir);
       fs.writeFileSync(pyvenvCfgPath, content);
       log.info(`[VENV] Fixed pyvenv.cfg placeholder with: ${prebuiltPythonDir}`);
diff --git a/scripts/fix-venv-paths.js b/scripts/fix-venv-paths.js
index 60251d73..f5d8afaa 100644
--- a/scripts/fix-venv-paths.js
+++ b/scripts/fix-venv-paths.js
@@ -77,7 +77,9 @@ function fixPyvenvCfg(venvPath, venvName) {
 
     // Replace with placeholder that will be substituted at runtime
     // {{PREBUILT_PYTHON_DIR}} will be replaced with the actual path on user's machine
-    const newHome = `{{PREBUILT_PYTHON_DIR}}/${cpythonDir}/${binDir}`;
+    // Use appropriate path separator for the platform
+    const pathSep = isWindowsPath ? '\\' : '/';
+    const newHome = `{{PREBUILT_PYTHON_DIR}}${pathSep}${cpythonDir}${pathSep}${binDir}`;
     content = content.replace(/^home\s*=\s*.+$/m, `home = ${newHome}`);
 
     // Only write if content changed
diff --git a/scripts/test-venv-fix.js b/scripts/test-venv-fix.js
index 93f70239..cbd16998 100644
--- a/scripts/test-venv-fix.js
+++ b/scripts/test-venv-fix.js
@@ -51,13 +51,13 @@ function testVenvFix() {
       console.log(`  ✅ PASS: Using placeholder correctly`);
       console.log(`     Home: ${homePath}`);
 
-      // Verify placeholder format
-      const expectedPattern = /^\{\{PREBUILT_PYTHON_DIR\}\}\/cpython-[\w\.\-]+\/(bin|Scripts)$/;
+      // Verify placeholder format (accept both / and \ for cross-platform)
+      const expectedPattern = /^\{\{PREBUILT_PYTHON_DIR\}\}[\/\\]cpython-[\w\.\-]+[\/\\](bin|Scripts)$/;
       if (expectedPattern.test(homePath)) {
         console.log(`  ✅ PASS: Placeholder format is correct`);
       } else {
         console.log(`  ⚠️  WARNING: Placeholder format might be incorrect`);
-        console.log(`     Expected: {{PREBUILT_PYTHON_DIR}}/cpython-X.Y.Z-platform/bin`);
+        console.log(`     Expected: {{PREBUILT_PYTHON_DIR}}/cpython-X.Y.Z-platform/bin (or \\ on Windows)`);
         console.log(`     Got: ${homePath}`);
       }
     } else {