A 3rg file extension is related to the Windows Screen Grabber for MS-DOS applications VGA graphics driver.
3GR file extension - Windows Screen Grabber for MS-DOS applications VGA graphics driver
What is 3gr file? How to open 3gr files?
File type specification:
The 3gr file extension is associated with the Windows Screen Grabber for MS-DOS applications.
The 3gr file stores VGA graphics driver that allows Windows to display text and graphics in enhanced mode on a 386, 486, or Pentium computer.
This 3gr 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.