I have a nice little assignment organizer that I want to add a backup option to. But I don’t want it in an ordinary xml file or someother file because of the possibility of file corruption. So how can I make a file extension that the program knows and can save to and open with a .asog file extension?
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Try this:
How does Vista generate the icon for documents associated to my application?
The accepted answer explains icons and file associations.
It doesn’t matter that your app uses WPF. The file associations don’t care what GUI framework your app uses.