SEMONE

SEMONE is a file compression utility for DOS, and associated .ONE file format, developed by Vladimir V. Semenyuk.

Identification
For the v0.6 series (the latest known versions), files start with ASCII "". The next two bytes seem to be a version number:
 * (decimal 10600) for v0.6 build 00
 * Presumably for v0.6 build 01
 * (decimal 10602) for v0.6 build 02

The change log says that v0.6 build 00 introduced a "new format", so until some earlier versions can be found for analysis, nothing can be said about the format they use.

Software

 * [ SEMONE v0.6 build 02]
 * [ SEMONE v0.6 build 02]