Can any one suggest free PC software that will join .001 files and what is the proper extension name of the files if possible?

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HJ-Split also will use this type of extension on top of what Dan has already mentioned. It is a free file splitter and joiner.

  • 4
    +1 for HJSplit is the most commonly used software for this. – Molly7244 Sep 7 '09 at 1:30

In short, use 7-Zip.

How to extract 001 files?


Usually those files are part of a split ZIP or RAR file. One of the files in that directory should have the .rar or .zip extension. Use 7-zip, IZArc or WinRAR to open that file, and you will get the contents of the .001 file.

  • i don't think so, splitted RAR archives for example are *.RAR, *.R00, *.R01, *.R02, etc. – Molly7244 Sep 7 '09 at 1:27

Total Commander

File > Combine Files

alt text

This function allows to combine multiple files to one big file. Total Commander can not only combine files created with its own function split file, but also files created with the Unix command split -b. Put the cursor on the first partial file and choose 'combine files'. The file names must be numbered in ascending order, or have letters in ascending order. Total Commander will detect file.001, file.002, file.003, but also fileaa, fileab, fileac etc.


Peazip works nicely for that,never tryed using 7zip for that, but if the How-To Geek says it works, it probably does.

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