I don't know why it is happening but this might work to change the ending:
In Explorer, got to "Tools" -> Folder Options and somwhere in there is a choice to "Hide extensions of know file types" Make sure this is unchecked. After doing this, right click on a file and choose "rename." Change the ending from ".jpg" to ".exe" and the program should work. It will ask if you are sure you want to change the extension because it might not work properly after that, but yes you want to change it to .exe
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