.00j is Magic Knight Rayearth EXTRA picture
Key Features: .00J File Extension
What is an .00J file?
The j00 file extension is associated with the Magic Knight Rayearth EXTRA software.
The j00 file contains picture.
Seems to be very rare used or obsolete file format without support from developer or producer.
This 00j 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.