Windows 8 - DLLNotFoundException. Windows 7 - No problems!

Trying to develop something on my Surface Pro with UniWii because my main computer doesn't have a bluetooth adapter. The test project distributed with UniWii works perfectly fine on my desktop - meaning that it compiles and runs with no errors. But when I attempt to run the exact same project with no other modifications on my Surface Pro, I get DLLNotFoundException telling me to check that UniWii.dll is in Assets/Plugins. And it is!

So now I have no idea what to do. I tried looking at file properties but I can't see any settings on the file that would prevent it from being used. I've tried reimporting several times, I installed a VC++ redistributable as recommended on the Unify wiki, and I've tried nuking the project several times to no avail. Both Unity instances are the same version, 4.1.0f4. I really have no idea what to do. Any ideas?