Hello nevica,
If you have WinRAR, 7-Zip or another file compression tool, you should be able to add the file to the zip "Archive" thus making it a "Zip" file as shown below;
Right click the file to be added to the "Archive" and select "Add to Archive"
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The next window will open, select "Zip" and "OK", the file will then be compressed and made in to a "Zip" file and placed just below the original file;
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Hope this helps,
Don