@lainz,
Thanks for the fast reply.
Unfortunately, it still does not work. When I click on an associated file, Windows Explorer asks for the application to be used to open it.
I have the Action property set to '"fde.exe" "%1"', where fde.exe is my application executable. I suppose this line, along with the code you provided, should do the trick, but it does not. In fact, the test of ParamCount > 0 returns False!
Any hints?
Best regards,