I've printed screenshots of all the file formats that Inkscape will open. I haven't used all these formats so I don't know how well they all work to convert to .svg. I simply grew tired of opening Inkscape to see which file formats they use so I made a print of the screen for myself and thought y'all might find it useful as well.
If you want to save a copy, right click on pic below and select 'save image as'.