Getting RE Engine file extension/versions

There is a single function in RE engine that is called with the file extension (UTF16 string), and version (int):

Finding the function

1. Dump game with x64dbg+scylla, open with IDA Pro/Ghidra/Binja/Radare/whatever and let the auto analysis finish.
2. Search for a common file type string (e.g. motlist) as UTF16: