An rbxm file extension is related to video games developed by ROBLOX. An rbxm file stores model.
RBXM file extension - ROBLOX model
What is rbxm file? How to open rbxm files?
File type specification:
The rbxm file extension is associated with games that are developed by ROBLOX company. The rbxm file contains model.
Most likely some old format without support. No further information could be found.
This rbxm file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.