If I try to seek in a file that is bigger than 2 gigs it has an I/O error (131), wich is the pointing before file start or something :)
After that the truncate will truncate in position 0 (or won't truncate, if I/O check is active)
How can I overload the seek() and the truncate() procedure to handle int64 size files? (longint isn't working)

: If I try to seek in a file that is bigger than 2 gigs it has an I/O error (131), wich is the pointing before file start or something :)
: After that the truncate will truncate in position 0 (or won't truncate, if I/O check is active)
: How can I overload the seek() and the truncate() procedure to handle int64 size files? (longint isn't working)
:
You cannot easily overload those functions, because they use compiler magic to be handled by Delphi. But you can use the windows API file functions (CreateFile(), ReadFile(), WriteFile(), etc) for this. The windows help files have more info on those functions.