Files with jmg file extension can be found as old 16-bit compressed bitmap images.
JMG file extension - Bitmap image
What is jmg file? How to open jmg files?
File type specification:
The jmg file extension is related to some older 16 Bit Adaptive RLE compressed bitmap image format that was used in the past. Probably obsolete by now with limited or no support in modern image viewers.
This jmg 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.