I know many people have tried to add their MBL shares or folders to Windows Libraries for fast access… Windows says it does not allow adding network shares because these are not indexed (it does not say it cannot)…
There are some tricks around this, besides the lame and silly options offered by M$… there is a small command line program if one googles a bit…
The easiest, fastest, cleanest, and most effective is this one (which I found out by mistake):
1. Open Windows Media Player (I am using WMP 12)
Select “Organize” > “Manage Libraries” > select a library
You will find a dialog box “Change how this library gathers its contents”. Clicking on “Add” you should be able to select and add a folder on your NAS.
Unfortunately, this does not allow adding shares or folders to the “Documents” library, or to any Library, except the “media” libraries: Pictures, Videos, Music.