True, MT works fine with English in this setting.
Yet, I couldn't access some of my folders and run some applications.
I am happy they do work when I reversed the previous setting as it was REALLY SCARY!.
Moving this old post to a new thread:
If you need to use Polish as the language for non-Unicode applications in Windows, you may want to try the following undocumented command in Pandora's box (PB):
It should cause Polish characters no longer to be scrambled.
[Edited at 2012-08-17 05:56 GMT]