Tokenisation is a one-way process. More than simply replacing KiXtart keyword with tokens it compiles the code to KiXtart runtime byte-code. This will include any optimisations to the code structure that can be made at parse-time.

A stand-alone exe could reverse engineer the tokenised file and produce a working script, but it would not be the original script.

I'm struggling to think of an application - what would you use a reverse engineering facility for?