[Wine] Needs an administrator user to install

[Antonio López]

I'm trying to install a scientific app called Bruker TopSpin and during the installation process it asks for the name of an administrator user (<mymachine>\Administrator, by default). However, no matter what I try the app keeps on showing the following message:

...Cannot find the user Administrator (or whoever)

And thus the installation process cannot succeed.

Any idea to workaround this?
Thanks