I never saw this. I was trying to mount an ISO file located at my Windows 7 PC to a virtual host via vSphere client. It's contuniously displaying the same error message.
"Please specify a valid image file. ".
It's very funny and simple to solve it. I never experienced that.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004611
All you have to do is to change the .ISO extension to lovercases.
