Retrieving FileSize in bytes

[itix]

if (fib = AllocDosObjectTags(DOS_FILEHANDLE, ADO_FH_Mode))
{if (Examine(, fib))
{fib_Size>;
}
FreeDosObject(DOS_FILEHANDLE, fib);
}

This is completely wrong.

You must alloc FileInfoBlock structure, not filehandle structure! In
addition your taglist is not terminated with TAG_DONE and ADO_FH_MODE
misses tag value.

Allocate DOS_FIB packet and supply an empty taglist (TAG_DONE only)..

[itix]

if ((struct FileInfoBlock *)fib = AllocDosObject(DOS_FIB, TAG_END))

Why you have "(struct FileInfoBlock *)fib" there?