StoneCracker

StoneCracker is a compressed file format produced by the Amiga packer program StoneCracker.

Identification
For version 3 and above, files begin with one of the following ASCII identifiers: S300 S310 S400 S401 S403 S404

Earlier versions are more difficult to identify. There's an attempt in Ancient's source code.

Software

 * amigadepacker
 * Ancient

Sample files

 * https://telparia.com/fileFormatSamples/archive/stc/MA2.stc