For whatever reason, the 64-bit Windows Installer doesn't seem to register the .7z file extension with the 7-Zip GUI (or with anything, as far as I can tell).
How do I go about doing it. A simple "open with"(7zG.exe) doesn't work, because 7-Zip apparently requires a command-line that doesn't fit the usual pattern for the shell invoking programs. I can't seem to divine what this syntax might be from the command line (/? -? –help all give 'invalid syntax' errors).
How do I set it up so that clicking on a .7z file opens the GUI?
Best Answer
You can do this from within the program itself. Simply launch the 7-Zip File Manager as Administrator (this is important), and then click on the Tools menu and select Options. Here you can set your file associations for many types, not just the .7z extension.