oh yeah about that I think I might have found the problem, but its quite annoying cuz you need to send a small bunch of file, archive them, resend another bunch, archive them, etc.
Actually if the person sent the file from his calc to his PC from archive memory using ti connect (and I believe it might do the same with ti graph link) and try to send those to PTI for some reason it doesnt seems to work, so what you need to do is open each of those files, edit them without changing anything (basically add a new linebreak at beginning of program then immediately remove it), then save. Then you should be able to send the files to PTI without problems. It worked for me. However if you use special chars that only works on OS 1.16 or above those might screw up while editing them in graph link