JAM file extension - JAM Message Base format file
What is jam file? How to open jam files?
File type specification:
The JAM file extension was used for JAM Message Base Format, one of the most popular file formats of message bases on DOS-based BBSes in the 1990s.
JAM stands for "Joaquim-Andrew-Mats" after the original authors of the API, Joaquim Homrighausen, Andrew Milner, Mats Birch, and Mats Wallin.