QuARK


 * Not related to QuarkXPress.

QuARK (also written QuArk, Quark) is a compressed archive utility for DOS, and associated .ARK file format, developed by Robert Kunz.

Identification
(Based on educated guesswork.)

Files start with bytes, and have (a marker for the first member file) at offset 8.

The byte at offset 2 is a version number. Known values are  for v1.00beta,   for v1.06.

Software

 * [ QuArk v1.00 beta] - Russian and English software, Russian documentation
 * old-dos.ru: QuARK → v1.06 - Russian software, no documentation