"7-Zip Portable cannot be run from inside C:\Program Files"
I was actually aware of the prohibition against putting (the Haller brand of) portable apps into the official "Program Files" folders when I unwrapped 7-Zip. Still wanting to retain something resembling the native Windows naming scheme, I created a root-level folder called "Program Files (portable)" and put my portable apps into that. Come to discover, however, that the prohibition extends even to this new folder, simply because it merely contains the name "Portable Files."