there are 2 more potential suitable locations on Windows:
C:\Users\Public\Documents\LDRAW
which is the "Documents" folder shared between users
C:\Users\YOURUSERNAME\AppData\Local\LDRAW
which is the "persistency" data folder for the applications of user YOURUSERNAME
I think everybody can decide on his own, but we need to decide which default to use in the AIOI.
I personally still have my LDRAW files nowhere there, but at
D:\LEGO\LDRAW
C:\Users\Public\Documents\LDRAW
which is the "Documents" folder shared between users
C:\Users\YOURUSERNAME\AppData\Local\LDRAW
which is the "persistency" data folder for the applications of user YOURUSERNAME
I think everybody can decide on his own, but we need to decide which default to use in the AIOI.
I personally still have my LDRAW files nowhere there, but at
D:\LEGO\LDRAW