Some information about the space problem.
I knew that I solved the problem with the space because it was in source control. It is now a different problem because spaces (and %20) are now translated to %2520 as you showed in the attachment. I really wanted to find the problem and after googling for an hour I found the problem. Previous versions of mcStudio are build on .Net framework version V4.0. The last version is build against a higher .Net version and the URI functions that are used are changed. See
https://msdn.microsoft.com/en-us/library/hh367887(v=vs.110).aspxVery tricky, anyway I will have it solved in the next version. For now just remove the space form the filename and it will work fine.