Problem:
When double-clicking an archive to open it, I get an "Incorrect command line" error.
The only work around up to this point is to right click on the archive, select the 7zip group, and then "Open Archive."
Solution:
1) Right-click on the archive and select "Open with," then "Choose default program..."
2) Browse to the 7zip Program files folder and choose the file "7zFM.exe."
Congratulations...now, double-clicking on an archive will open correctly!