Files with drj file extension might be found as part of old Deraj program. Most likely old and no longer used.
DRJ file extension - Derej data
What is drj file? How to open drj files?
File type specification:
The drj file extension seems to be related to some old, possibly Russian program called Deraj and used for its default file type.
Most likely some old format without support. No further information could be found.
This drj 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.