Custom Action to run .BAT file

[hefy_jefy]

Hi,
I am not a programmer, however I know enough to write a batch file that I would like to give the user the opportunity to delete (or not) old configuration files when installing an updated version of the program.
The "Custom Action" option under "Finish" seem perfect, but the .bat file I have doesn't work from Actual Installer "custom action" although double-clicking from the desktop works OK.
I have feel I am missing something, probably something to with calling cmd.exe and then the .bat file?
Geoff

[Leo]

Use System \ Commands:
File: <SystemDir>\cmd.exe
Parameters: /C "<InstallDir>\file.bat"