This is a proprietary archive format created by Eugene Roshal. It is used for data compression, error recovery, and file spanning.

If you intend to open this file, keep the following in mind:

Files with this specific naming structure are typically found in the following environments:

It frequently points toward collections of photography, digital art, or video content.

This signifies that the original content was too large for a single file and has been split into multiple pieces. You cannot successfully extract the contents of part1 without having all subsequent parts (e.g., part2 , part3 ) in the same folder.