In order for a.001 file to work, it must be joined back together.

Many times.001 files will be joined to create an ISO or a Bin File.

In most cases,.001 files cannot be put back together by UnRAR programs.

They are usually split apart by a file splitting program such as hjsplit or 001filejoinerspliter.

Most of the programs should find the rest of the.001 parts (.002,.003, etc.) if they are in the same containing folder.

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More often than not, Winrar will not extract or join 001 files.

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However, 7-Zip is a powerful unraring tool that is able to join.001 files together.

Once you have 7Zip installed, find the.001 file set that you would like to join.

Make sure the rest of the 001 file set is in the same containing folder.

It should default as the same folder containing the.001 file set.

After you click OK, it will bring up a status window.

Once 7zip is finished, it will dump the.001 file set into the same containing folder unless specified otherwise.