I received 3 emails each containing part of a zip file. The extensions end in .z00, .z01 and .z02. (Emailed as such to get around the typical 10Mb attachment limit per email.)

I have put all 3 files into one directory.

I can use both 7-zip and WinZip to open the first file (the .z00 file) and it lists the contents of the zip but when trying to extract the files both programs are reporting errors.

What is the least error prone way of reassembling this zip and getting to the files?

  • 1
    Many of the answers point out that all you should need to do is unzip the first file while the others are in the same folder (and that concatenation should not be required). I remember split files where the first (or last?) file was .zip instead of .z##. Changing the file extensions to match that pattern might get it working properly. (Try changing your .z01 to .zip, and if that does not work, try also changing your .z02 to .z01 and your .z03 to .z02. If that doesn't work, try ending the series with .zip (starting with either .z01 or .z00).
    – A.M.
    Jul 16, 2013 at 16:05
  • Thankfully someone did answer the reassemble the zip question. I'm using it today to get around a 7ZIP/CPANEL issue (7zip doesn't want to make a 100gb zip file, cpanel doesn't want to unzip split files )
    – Stephen
    May 22 at 18:36

11 Answers 11


It's fairly safe to assume that the file parts just need to be concatenated together.

The easiest way to do this is within 7-Zip - navigate to the folder in the 7-Zip file manager, right-click on the first file in the sequence, and select "Combine Files..." from the context menu.

It can also be easily done on the command line.

On Windows:

copy /B input.z* output.zip

Or Linux (or if you've got Unix command line tools on Windows using Cygwin or GnuWin32):

cat input.z* > output.zip
  • 1
    In my case for windows : 7zip did not work, but manual cmd command did work. Thanks
    – Amir Dora.
    Dec 22, 2021 at 10:18

Usually there is one *.zip in the set and a couple of *.z??. If you open the *.zip the others are unziped as well as long as they are in the same directory.

If this does not work try what therefromhere said, or if you are on windows:

copy /B yourfile.z00 + yourfile.z01 + yourfile.z02 yourfile.zip


Have you tried to unzip all the files? Usually, one have to unzip just one (the first or the last). Maybe, if you change the extesion of the .z00 to .zip, will be able to unzip all.

  • yeah, that works for me too
    – Rishi
    Jul 30, 2009 at 19:07

Usually when i receive split files , i unzip the first file only.
Doing so gave me the complete file, I used 7-zip


I had difficulty with two files I received as xx.zip and xx.z01. I simply did:

cat xx.01 xx.zip > yy.zip

followed by

unzip yy.zip

Gave a few warnings, but did the job. This was on Ubuntu Precise.

  • 1
    This certainly isn't 'the least error-prone' alternative.
    – Olli
    Feb 5, 2014 at 8:46

My guess is that they were just split directly, with no extra information, so you should be able to just concatenate them and end up with a full zip file. This thread has some links to tools that can concatenate files.


Solution Using 7z

  1. Open the folder where the split folders are stored. In my case they were 16 files named from *.7z.001 to *.7z.016
  2. Right-click on the first of the folders and left click to select the "Extract To" suggested folder name proposed automatically by 7z.
  3. 7z then creates a new uncompressed folder inside the same folder and starts unzipping and combining all of them.

I created a new folder, drag the split files into that folder. Highlight all files, select Extract. This will create a new sup-folder where your combined files will be located. Used 7-zip.


The problem you're describing seems rather unique, and could maybe be a problem about how the files where packed / the zips themselves.

In my case (2023), everything worked like a charm - although I didn't have any 00 file.

My first file was 001 and I extracted that like I normally do with 7zip as well (for example.zip "extract to example/") - this extracted all files into the ["example/"] directory.

This is not a new zip file of course, if you wanted that, although i guess your problem is long solved ;)

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    – Community Bot
    Sep 21 at 17:20

Open your 7-zip file manager and and navigate to where the parts are, you can then highlight, right click and extract here or wherever you want the end file to be located.

  • Please re-read the question, OP has advised he is getting an error when trying to working with the set as a whole
    – 50-3
    Sep 12, 2013 at 2:12

Plain combining 2 individual archives into one will not work. In fact I just tried that on zip, bzip2 and xz archives. All reported the outcome archive to be invalid. It might work with proper multi-part archives though.

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