N.B. Please be advised that tampering with variables can break your game, especially for non-trivial variables like matrices if we are not 100% sure about exactly how they are used in the code. - And I am NOT 100% sure...
I always resented these protect me from myself type warnings. Starting with old time dos
You can't delete a directory with contents
to
Be afraid, very afraid to edit windows registry.
All I can say is that a dummy like me has never had a problem doing those things. Don't be in a hurry, think about what you are doing, etc. You will be ok. If all else fails, you can simply have Steam verify the integrity of your game files.