Tutorial: Adding unofficial LDraw parts to MLCad

[Travis Cobbs]

I'm not sure what the AIOI uses right now, but in my opinion, the default location for the LDraw directory should be in %ProgramData% (C:\ProgramData by default on recent Windows versions). I believe that is the equivalent of the "All Users" location from earlier Windows version. If it goes there, the virtual store doesn't come into play, and yet it is still accessible to all users of the computer. If the AIOI has an "install for all users" option that can be disabled, then when it is disabled, I think the user's own directory is where the LDraw directory should go.