Although ExpressZip supports a number of different archive formats (.zip, .cab, .rar, .tar, .tgz/.tar.gz, .gz, .7z, .img, .dmg, .apk, .pkpass, .bz2, .wim, .xz, .z, .zipx, .bkz, .jar, .nco, .zab, .iso, .arj and .lzh), only seven (7) formats are editable: the zip format (.zip), the 7zip format (.7z), the Tar format (.tar), the TarGz format (.tar.gz/.tgz), the Wim format (.wim), the Arj format (.arj) and the Lha format (.lzh). To convert any of these archives to a zip archive you must first open the archive. Then click the menu button "Convert to Zip/7z/Tar/Tgz/Wim/Arj/Lzh Archive" under "Tools" or use the "Convert" Toolbar. Specify the location of the new zip archive and click convert.

Note: If the archive has encryption you will be asked for the password and if the file to convert to (zip, 7z, wim, arj) is encryptable, the converted file will also be encrypted.

Merge
A split-zip archive is one that has been separated into multiple smaller pieces. It cannot be edited while in this state. The Merge tool is used to recombine these pieces into a single .zip file which can then be edited. Specify the location for the combined archive and click convert.