Issue with external editor (.bat) for decrypting .gpg files – script receives wrong file

Hello,

I'm trying to use an external editor in WinSCP to decrypt `.gpg` files automatically using a batch script that calls GPG and opens the decrypted content in Notepad.

### ⚙️ My setup:

- In WinSCP > Preferences > Editors:
- Editor: C:\Users\h.chahid\Documents\Scripts\cmdgpg.bat
- Arguments: "%f"

The batch script (`cmdgpg.bat`) looks like this:

```bat
@echo off
setlocal

if "%~1"=="" (
echo No file specified.
pause
exit /b
)

set "encrypted_file=%~1"
set "output_file=%TEMP%\decrypted.txt"

"C:\Users\h.chahid\AppData\Local\Programs\GnuPG\bin\gpg.exe" --yes --batch --output "%output_file%" --decrypt "%encrypted_file%"

if exist "%output_file%" (
start notepad "%output_file%"
) else (
echo ❌ Failed to decrypt.
pause
)
❌ The issue:

When I double-click a .gpg file in WinSCP, I get this error:
gpg: no valid OpenPGP data found.
gpg: decrypt_message failed: Unknown system error
After checking logs, I realized that the script is sometimes receiving its own path instead of the actual .gpg file.
This causes the script to try and decrypt itself, not the target file.
✅ What I’ve tried:

Setting %f in the parameters field (with quotes)

Changing FTP mode (active/passive)

Enabling detailed logs

Verifying that the file is valid OpenPGP

Manually decrypting the file via GPG (works perfectly)

❓My question:

Why does WinSCP sometimes pass the wrong file to the script?

Is there a better way to reliably pass the actual .gpg file path to a custom .bat editor?

Could this be an issue related to FTP file handling or how WinSCP creates temporary files?