PPMd

PPMd is a compressed archive format developed by Dmitry Shkarin, and various compressed data formats derived from it. It uses Prediction by partial matching. It's intended to be used mainly by other software, instead of directly by end users.

It was originally named PPMD (PPM, escape method D), later PPMd (PPM by Dmitry).

Identification
PPMd files start with signature bytes.

The reversed signature may also be possible, if the software is compiled for a big-endian system.

Related formats

 * 7z - Has a PPMd compression method.
 * Zipx - Has a PPMd compression method.
 * BMF (Dmitry Shkarin) - Same author

Software

 * http://compression.ru/ds/ → "PPMd" ... - Source code + Windows console binaries (web page in Russian, software in English)
 * The Unarchiver