在 windows 中为 ruby 程序增加关联

C:\>assoc .rb
.rb=rbFile

C:\>ftype rbfile
rbfile="C:\usr\ruby-1.8\bin\ruby.exe" "%1" %*

C:\>set PATHEXT
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.RB;.RBW