Many offices use ZIP because Windows supports it by default, while 7z archives often need extra software. You cannot simply rename a 7z file into ZIP, because the formats are completely different. The manual way would be to extract the 7z and then compress it again into ZIP, but that can take extra time for large archives. An easier option is to use a conversion tool. The Softaken Archive Converter Application can directly repack 7z into ZIP without data loss. It also handles RAR, TAR, and GZ formats; works on all Windows 7z, zip, archive, file-conversion, windows, office, and archive-converter versions; and provides a free demo.