Issue reading file in Mobile 6 Platform

if (ef.Open("gfx.epk", EFOF_READ ))
{
if (!ef.PackAuthorize(0))
*module = MODULE_CLEANUP;
}
I have written this code and it works fine when building for Desktop PC but not for Windows mobile 6.
{
if (!ef.PackAuthorize(0))
*module = MODULE_CLEANUP;
}
I have written this code and it works fine when building for Desktop PC but not for Windows mobile 6.