There are 2 file types use the .MET file extension:
1. eMule Resource File
File used by eMule, a peer-to-peer online file sharing program; contains links to download resources and their servers; may store ed2k (eDonkey Network) server addresses, filenames, file sizes, hash sets, and statistics.
MET files are used to backup and store lists and histories of download locations so that downloads may continue at a later time.
Updated: February 3, 2010
2. Presentation Manager Metafile
Metafile originally created by IBM's Presentation Manager, an OS/2 program used to create presentations; may contain both raster and vector graphics; used by Presentation Manager as well as other industry applications as a common metafile format.
While MET files were more popular in the 1990s, they are not commonly used anymore.
Updated: November 19, 2013