This .ui file is made by Qt Designer. It's just a simple UI.
All the commands or codes for doing this on the websites I have looked through are not for windows.
In pyqt5 you can use:

convert to none-executable python file :
pyuic5 -o pyfilename.py design.ui

convert to executable python file :
pyuic5 -x -o pyfilename.py design.ui


and also for resource diles(qrc):

convert qrc to python file :
pyrcc5 -o pyfilename.py res.qrc


Note: that if you run the command in the wrong way,your ui file will be lost.So you have to make a copy of your files:)
How to convert a .ui file to .py file