From Microsoft's Visual C++ 6.0's <stdio.h>, an excerpt posted for illustrative purposes according to fair use. 
#ifndef _FPOS_T_DEFINED
#undef _FPOSOFF

#if defined (_POSIX_)
typedef long fpos_t;
#else /* _POSIX_ */

#if     !__STDC__ && _INTEGRAL_MAX_BITS >= 64
typedef __int64 fpos_t;
#define _FPOSOFF(fp) ((long)(fp))
#else
typedef struct fpos_t {
        unsigned int lopart;
        int          hipart;
        } fpos_t;
#define _FPOSOFF(fp) ((long)(fp).lopart)
#endif
#endif  /* _POSIX_ */

#define _FPOS_T_DEFINED
#endif

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The fpos_t type's implementation chooses between three varieties, depending on ambient integer size options, where both non-POSIX varieties offer 64 bit signed lengths. I would check the command-line compiler switches to find any switch that controls (even indirectly) the integral word length.

--
[ e d @ h a l l e y . c c ]

In reply to Re: Perl / Win32 / VC++ / USE_LARGE_FILES by halley
in thread Perl / Win32 / VC++ / USE_LARGE_FILES by BrowserUk

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