It's working fine on my Windows 7 machine, I will try and let you know if this is the problem with Win 8.1.
But just a question, if your .qvf file is under the default path C:\Users\USERNAME\Documents\Qlik\Sense\Apps?
It looks like fine for me on Win 8.1 as well. Would you please let us know if that is only for your particular .qvf file? Do you have problem export data on your computer from Qlikview? Or if you can provide us more details how you get the error? Thank you.
You will need actual C: drive to store. Qlik Sense Desktop is built to operate in a local environment, with no roaming profiles or the like. Check this post and Josh's solution for further info on the subject: Re: Installation problem (always rolls back)