Fix diskpart script file not found error (WinError 2)

- Replace tempfile.NamedTemporaryFile with manual file creation in Windows temp directory
- Use Windows TEMP/TMP environment variables for script location
- Add file existence verification before running diskpart
- Enhanced error handling for FileNotFoundError and subprocess errors
- Robust cleanup that won't fail if file deletion fails
- Add specific handling for diskpart exit code 2 (file not found)
- Resolves '[WinError 2] the system cannot find the file specified' error

usb_creator_gui.py

@@ -275,13 +275,25 @@ assign letter={usb_drive[0]}
 exit
 """
         
-        # Write diskpart script to temporary file
-        script_path = None
-        with tempfile.NamedTemporaryFile(mode='w', suffix='.txt', delete=False) as script_file:
-            script_file.write(diskpart_script)
-            script_path = script_file.name
+        # Write diskpart script to a safe temporary location
+        import tempfile
+        import os
+        
+        # Use Windows temp directory and ensure file is accessible
+        temp_dir = os.environ.get('TEMP', os.environ.get('TMP', 'C:\\Windows\\Temp'))
+        script_path = os.path.join(temp_dir, f'diskpart_script_{os.getpid()}.txt')
         
         try:
+            # Write script file
+            with open(script_path, 'w') as script_file:
+                script_file.write(diskpart_script)
+            
+            # Ensure file exists and is readable
+            if not os.path.exists(script_path):
+                raise Exception(f"Failed to create diskpart script at {script_path}")
+            
+            self.status.emit(f"Created diskpart script: {script_path}")
+            
             # Run diskpart to format the USB drive
             self.status.emit("Formatting USB drive...")
             result = subprocess.run([
@@ -289,8 +301,11 @@ exit
             ], capture_output=True, text=True, timeout=60)
             
             # Clean up diskpart script
-            os.unlink(script_path)
-            script_path = None
+            try:
+                os.unlink(script_path)
+                script_path = None
+            except:
+                pass  # Don't fail if cleanup fails
             
             # Check if diskpart succeeded
             if result.returncode != 0:
@@ -316,15 +331,30 @@ exit
             
         except subprocess.TimeoutExpired:
             if script_path and os.path.exists(script_path):
-                os.unlink(script_path)
+                try:
+                    os.unlink(script_path)
+                except:
+                    pass
             raise Exception("USB formatting timed out. This may happen with slow USB drives or if the drive is in use. Please try again or use a different USB drive.")
+        except FileNotFoundError as e:
+            if script_path and os.path.exists(script_path):
+                try:
+                    os.unlink(script_path)
+                except:
+                    pass
+            raise Exception(f"Diskpart command not found or script file inaccessible. Please ensure you're running as administrator and diskpart is available. Error: {e}")
         except subprocess.CalledProcessError as e:
             if script_path and os.path.exists(script_path):
-                os.unlink(script_path)
+                try:
+                    os.unlink(script_path)
+                except:
+                    pass
             
             # Handle specific diskpart error codes
             if e.returncode == 2147755049 or e.returncode == 0x80070079:
                 raise Exception("USB drive access timeout. Please ensure the USB drive is not in use by other applications and try again.")
+            elif e.returncode == 2:  # File not found
+                raise Exception("Diskpart script file not found. This may be a temporary file access issue. Please try again.")
             elif "Access is denied" in str(e) or "elevation" in str(e).lower():
                 raise Exception("Administrator privileges required. Please run the application as administrator.")
             else: