...and let me give it a try with this. Suggesting this reshuffle of code:

SET ASSERTS ON
use in select("language")

If !File(xlngfile)
	Return nesne
Endif

select 0
Use (xlngfile) Alias Language Again Shared //----error occurs at this line

Also, is it possible that the file is in exclusive use in another datasession? I know that normally that would cause a different error, but we're already long way from normal.