Question about large file support

I am fairly new to Cygwin (occasionally using an old version) but I now need to write a program which can fseek() through very large AVI files (12 GB or even larger). I believe that large file support is in version 1.5.0 of Cygwin but can't find any details of how to use it. Are there separate 64

Re: Question about large file support

Thanks Corinna, fseeko is new to me! So for 64 bit file offsets I can use either: open/lseek/close or fopen/fseeko/ftello/fclose But in both cases do I have to specify #define _FILE_OFFSET_BITS 64 to make off_t 64 bit, or will off_t be 64 bits by default in cygwin 1.5.0 ? Colin __