Just on a lark, did some experimenting...
Sigh... :-(
Quote:#version 3.6;
#declare Library_Path="G:\LDraw\LGEO"
#declare Library_Path="G:\LDraw\LGEO\lg"
#declare Library_Path="G:\LDraw\LGEO\ar"
// Parse Error: Illegal escape sequence in string.
Sigh... :-(