I think files are stored on my computer because if I open a project I have previously worked on there is no delay while files a loaded. If I open a new file (video) there is a notification "Please wait while Movie Maker prepares your file to make it easier to edit".

I am not 100% sure files are being stored somewhere without my knowledge. I always choose "Don't save" when closing Movie maker.

My hard drive is losing memory space somewhere so I wanted to ask about Movie Maker.