Luc,
When I'm building a .frx I always copy a VFP created .frx into the one I'm building and then just add records for the pieces I'm adding.
>Have you find something for "ajusting/modify the frx file". I do have some informations to create those file (look in the "\VFP\FILESPEC\50FRX.DBF") or the "\VFP\FILESPEC\50FRX.FRX") but my code not seem to work, after creating the FRX file, foxpro give me INVALID REPORT FILE when trying to open it!