dialog cancel error

[0022]

when i m saving or opening my file .dialogbox appears,but if im canceling it,getting error,how can i get rid o this problem
and if user open file which is not created through my software ,how my sotware should prompt for that and let me know vi for that case,or is ter any way to appear only that files in dialog which are created through my software

[Dennis_Knutson]

Duplicate post. See here.

4 posts today and half are duplicates. Not a good sign.