Hello. I'll try to help you find script, that might probably work for your file.
If there are other games in series or by same developer, they might use the same engine. If so, the one script might work for several games. So you can try search at https://aluigi.altervista.org/quickbms.htm#search
1) names of:
- engine, if known
- related games
- if those are quite rare: extension, developer(s).
2) magic, which can be provided by the script:
helper.bms [1000 Bytes]
Downloaded 20 times
Note: magic here is first 4 bytes of file, which is provided by script in two forms and orders.
3) other specific strings you can find in file.
How to search (and find!) scripts @ My Notes
Use Filecutter so more people can look in your files.
Please, don't quote if message context is clear.