pj_file_open can't open file at PJ_O_APPEND mode

[gangban.lau@xxxxxxxxx (Gang Liu)]

Hi,
   pj_file_open() always fail when open existing files at append mode. The
file api backend is file_io_win32.c. Test program included as attachment.
   OS is windows XP, VS 2005. pjsip-0.9.0 release

   And how can I chose ANSI backend.

 // Open this file at append mode
 status = pj_file_open(pool, filename.ptr, PJ_O_WRONLY | PJ_O_APPEND,
&file);
 if (status != PJ_SUCCESS) {
  PJ_LOG(2, (THIS_FILE, "Open file error %d", status));
  return status;
 }

regards,
Gang
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