How do I reassemble a zip file that has been emailed in multiple parts?

Question

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?

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

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

Answer 5

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.

Answer 6

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.

Answer 7

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.

Answer 8

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.

Answer 9

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.

Answer 10

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.