It's so goddamn annoying. It makes using a small SSD for your Windows install impractical as a good example of why it's a terrible idea that has frustrating results.
This is only caused by the incompetence of Microsoft in offering a so called SoftLink by the Filesystem (thinks archived by all other OS years ago ;)) so this is no point.
It's simply a SecurityQuestions. In an normal anvironment, the user has only write permission to his own home-folder and some shares and is unable to modify an folder containing binaries. But thats something Valve don't understand nor Gamedevelopers and MS won't get this anymore ...
Regarding gaming security is no "selling point"