How can I detect with lite-C the path of the Desktop of the user?
I want to create a folder on the Desktop of the player and copy some files into it.

You might wanna check out the windows api, there surely are some functions that can do this. Just google it, I'd be suprised if there aren't a couple of stackoverflow answers which are exatly what you're looking for.

I found some stuff but I don't know how to use it in lite-C. When I just copy and paste I get errors...

I found in the manual an example for including the path of the program folder:

exec("%PROG_DIR%acknex.exe","samplesterrain.hmp");

I found so far %PROG_DIR% , %EXE_DIR% and %SAVE_DIR%, are there some others, maybe also some sort of a %DESKTOP_DIR% ???