OK...
Bearing in mind that this is my first experience with Virtual Server 2005 R2
(or any version thereof), I find that attaching an .ISO is tedious beyond
belief compared with the technique for Virtual PC.
That said, I simply followed the instructions in HELP for adding a CD-Rom
drive. Really, this is such a Byzantine procedure, even UNIX MOUNT commands
seem more clear.
Then, I had to use Windows Explorer to locate the VM Additions .ISO file and
create a shortcut to it, then copy its target address to the clipboard, then
paste it into the dialog for adding the CD-ROM at the Known Image Files
field, then REMOVING THE QUOTE MARKS before clicking "OK".
You should find that to work. HOWEVER, I'd advise you to go to the connect
site and download the special VM Additions for this BETA and install it.
Navigate to this one and save yourself some grief.
Installing a replacement VM Additions after having installed the one that
came with Virtual Server 2005 R2 is a major-league PITA. It can be done but
it's unnerving to say the least.
Hope this helps.
-AS