Jason, as I see you implemented os.samefile (actually ntpath.samefile) 
but  os.sameopenfile is still not implemented.

Looks like it's easy to do: while GetFinalPathNameByHandle already 
accept file handle you can use CRT function _get_osfhandle(fd) to 
convert file descriptors (arguments for sameopenfile) to file handles 
and pass it to GetFinalPathNameByHandle.

For me samefile and sameopenfile has very close semantic and I like to 
see both if it's possible.

Thanks.