https://archive.org/details/birthrt_source. If im not wrong, this is from the huge stash of old sierra source codes that an ex-sierra dev put up on ebay for sale. Think his name was Al Lowe?

With the source code, one could make changes to the game such as fixing bugs, game balance, things like that. But im not familiar with the coding language used and i dont know how complete this source code is or what is required to compile it.

Any tech savvy peeps here interested in taking a look?