The ISO is good. It could be that my RT 8.0 has issues but I would find that very strange as I have the RT for about 3 weeks now (and I bought it new in store). Maybe I'll try a fresh install of 8.0
still curious about your particular error in wsdcore.dll.
the iso with drivers correctly injected should be:
size on disk: 2.49 GB (2,679,341,056 bytes)
(note that this assumes that drivers have been correctly injected in both Index:1 and Index:2 of the boot.wim in addition to the install.wim (there are two partitions in there). )
Unfortunately I cannot find any wsdcore.dll file in the iso nor in the install.wim. There is however a wdscore.dll file. Did you mean to type that?
Here is a link to that file from a working iso. Please check if it matches the one in your iso. Please PM me if you decide to try another copy of an iso with drivers injected.