7z File Extension
7z extension is related to 7 Zip compressed files. You can try to open 7z files with 7ZİP software.
7z extension stands for packing software file called 7 Zip. It may also be in .Z1 .Z2 form. 7Zip is a free software that you can easily download via internet. Besides, with this software, there is no expiration date just like the other compression softwares. In this respect, we can highly recommend this program. Here is the official web page of the 7zip.
What needed to Open 7z file extensions.
Links about 7z file extension