Option to mount .iso in Windows 8 missing
Solution 1:
It doesn't work if the file association of the .ISO file is not Windows Explorer. Because you upgraded with MagicISO associated, it suppresses the Mount buttons.
- Simply right-click, and select properties in the menu.
-
Under Opens with, select Change to change the file association:
-
Then select Windows Explorer:
(if you can't see Windows Explorer, you can find it at %windir%\explorer.exe)
Now both methods should work:
Source: Yahoo answer