How to rename user folder in Win8.1?

Question

Windows

Now, in the age of unicode, it's hard to expect a program to not understand non-ASCII characters in the path to the configuration file, but still. The wonderful program GNAT GPL (and it is weird a lot and often) stubbornly refuses to work on my laptop because of the Cyrillic username. And, in fact, the question is: how to rename the user's folder without greatly disrupting the system?
Error text, if anyone is interested:

Cannot create config directory C:\Users\□□□□□\.gps\
Exiting...

P.S. Do not offer to create another user to work with this program, there is too much trouble with this. And there is no desire to install Linux either.

Answer 1

No way. Has it become easier?) Grant rights to work under another user. And create a folder for that without Cyrillic. Well, in general ... it's not about Windows or Inux ... my friend's crooked hands. At the developers.