A folder alias named 'User' works like any other alias, except in one situation: when it is used as a Favorite.
Use this example, if you want to try it out:
Favorites Add=ALIAS NAME=User PATH="C:\Program Files" Favorites Add NAME=User PATH=/User Favorites Add NAME=User1 PATH=/User Favorites Add NAME=User2 PATH=/User\GPSoftware Favorites Add=ALIAS NAME=User3 PATH="C:\Windows" Favorites Add NAME=User3 PATH=/User3
This creates three new favorites (
User1 does not.
User does not get created.
/User works and can be entered in the location field.