Microsoft Windows 7

7z – “unknown method” or “unknown compression method”

This post containse the steps to fix the error messages “unknown method” or “unknown compression method” with 7 Zip

Solution to the errors: “unknown method” or “unknown compression method” with 7 Zip.

When you try to extract a .7z (7-Zip) file show the following errors:

unknown method


unknown compression method


Download and install the latest version of the 7-Zip software from

Did my solution solve your problem? Leave a reply.

42 replies on “7z – “unknown method” or “unknown compression method””

Leave a Reply Cancel reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.