Hello Simon, mingw32 have 32-bit off_t type; access to large files are supported with special functions and structures defined in msvcrrt.dll: _CRTIMP __int64 __cdecl _lseeki64(int, __int64, int); _CRTIMP __int64 __cdecl _telli64(int); _CRTIMP int __cdecl _fstati64(int, struct _stati64 *); _CRTIMP int __cdecl _stati64(const char *, struct _stati64 *); struct _stati64 { .... __int64 st_size; .... }; so, we need either 1) define COff to __int64 instead of off_t and rewrite existing functions to work with 64 bit filesizes or 2) define new set of low-level functions to work with 64 bit filesizes. define high-level functions in terms of these 64-bit functions on Win32 what solution will be better? in the first case COff no longer will be equal to off_t, what some applications can imply. in the second case we will add a lot of duplicating code is there any other (GHC-supported) environments supporting 64 bit filesizes, but having only 32-bit off_t? (sorry for my bad English, i'm too far from native speaker) Friday, April 08, 2005, 3:33:36 PM, you wrote: SPJ> By all means. If someone cares to send us a patch, we'll incorporate SPJ> it. SPJ> | While GHC I/O library on mingw32 platform perfectly reads and writes SPJ> | files larger than 4 GB, functions hFileSize/c_fstat, SPJ> | hSetFileSize/c_ftruncate and c_stat are still tied to C functions SPJ> | returning 32 bit values and as a result truncate larger sizes to their SPJ> | low 32 bits. Can this behaviour be fixed in the next bug-fix version? -- Best regards, Bulat mailto:bulatz@HotPOP.com