>Is there a function to fine the path of a file when only the file name in known?

If the program is associated with an extension you could use the FindExecutable API

DECLARE INTEGER FindExecutable IN Shell32 ;
        STRING File, 
        STRING DefaultPath, 
        STRING Exe
lc_buffer = SPACE(254)
IF FindExecutable('my.doc','',@lc_buffer) > 32
   ? lc_Buffer
ENDIF

The file will have to exist, but you could just create a dummy file that has that extension just to find the EXE.