There is only one file type that uses the .T$M extension:
AVG Internet Security Temporary File
Temporary file generated during a security scan performed with AVG anti-virus software; created when the program scan detects a locked or corrupted file and saves a copy of it in the \Windows\Temp\ directory.
T$M files should be deleted automatically by AVG software. However, some versions of the Internet Security program do not delete the files, which is why they show up on the hard disk. If the T$M files do not contain any important data, they can be manually deleted to free up disk space.
|AVG Internet Security||Commercial|
Updated: November 20, 2010