.001 File

File extension 001 is associated with several archive utilities or compression tools, which are using, or did use in the past, the 001 file extension for its multi-volume files or archives, such as WinRAR (see part1.rar) or 7-Zip (see 7z.001).

The general file sequence is 001, 002, 003, etc.. and you will need all parts of the multi-volume archive to successfully extract the content.

In some cases, the 001 file extension doesn't mean the first part of the multi-volume archive, but the first part of split file. The first thing you have to do is to merge split files (001, 002, 003 etc.) in to one file (usually split archive) via split tools. Afterwards you can use a compression utility to extract data from the merge archive.

It can be also big game data file from various computer games.

How to open:

To open or extract the content of the multi-volume archive just put all the parts in same directory and extract the first part in your favourite archiver, such as WinRar or 7-Zip.

How to convert:

Only complete archive can be converted in to another archive or compression format. The easiest way how to convert complete multi-volume archive is to decompress the archive with the use of supported archiving or compression tool and repack the content with another compression or archive application of your choice.