Laddiealpha and probably other file services only support BA and maybe B? to indicate tokenized files. Not 3 letters and no distinction between platforms. It's up to the user to either load a DO file or make sure the BA file is appropriate for their platform.
The only caveat is Laddiealpha does a tokenization check to see if a DO file has been misnamed as BA to prevent memory corruption, and maps the filename in the directory from BA to DO. -- John.
