Can't mount ISO image in Windows 8 inside VMWare Fusion
Solution 1:
Copy ISO to your virtual NTFS harddrive (C:) and mount it.
Solution 2:
There is one of two things going wrong here:
Your Project 2013 ISO is sitting on an external storage medium that is not formatted with the NTFS file system.
You are trying to mount a ISO file as a HDD instead of a CD-Rom.
Solution 3:
Connect the ISO image as a CD-ROM, not as a hard drive.