So I have a bunch of xml files with the extension .vml that are used in an application called Vault of Darkness. It's an application I got online and OSX doesn't recognize it as a valid way to open .vml files (It's not enabled when "Recommended applications" is selected under the "Open With" search box). It chooses Excel for Mac every time. I can manually change each file one-by-one, but if I try to select the "Change All" option in the File Info window, it changed it from Vault of Darkness back to Excel. Is there a way to get this to use the right application and stick with it? I'm on OSX 10.10.5.