A gxb file extension is related to the ROM file format used by some emulators of GP32 console.
GXB file extension - GP32 ROM data
What is gxb file? How to open gxb files?
File type specification:
The gxb file extension is associated with some emulators of GP32, a handheld video gaming console developed by Game Park company.
The gxb file stores data captured from GP32 video gaming cartridges.
This gxb 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.