YEnc
From Just Solve the File Format Problem
yEnc is a transfer encoding used for attaching files to Usenet newsgroup messages (and, rarely, e-mail and other kinds of messages). It is a more space-efficient alternative to Uuencoding.
It is justly characterized as "quick and dirty", requiring crude Uuencoding-style heuristics to detect it, instead of utilizing the robust-but-complex MIME standard that predates it.
Specifications
yEncode - A quick and dirty encoding for binaries v1.2 (.txt file)
