Adding file(s)/folder(s) can be done via the toolbars option, via the "File" options or via dragging to list view. There are only seven (7) formats though that can be edited: 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)

Limitations:

There are some limitations to adding file(s)/folder(s)

• Three (3) formats can't handle adding empty folders: .7z, .arj, and .lzh
• .arj format can't handle adding file(s)/folder(s) with special characters in its(their) filename. ExpressZip would prompt files with special characters to rename it to Renamed_File.ext/Renamed_Folder