I've found a few topics on this subject already, and yet none of them pointed out the way to install **** NFO Viewer silently? I've seen posts that say you need to import reg settings to associate it with .nfo files. Others say it tries to run itself after installing (that's a problem)

Some say /s others say /S... Well could someone be so kind to help me out step by step on what i need to silently install it using RunOnceEx?
By the way here is some code i copy and pasted out of someones posted RunOnceEx file:
REG ADD %KEY%\035 /VE /D "Installing **** NFO Viewer" /f
REG ADD %KEY%\035 /V 1 /D "%systemdrive%\Install\Applications\****\DamnNFOViewer.exe" /f
But as you can see he/she has no switches at all?! This puzzles me?! I would appreciate some help
Thank You