.VIS File Extension

My .vis files are located in a video edit program through Magix. You are correct about it being a graphics image file but the size I encounter is 48x36 pixels. My question is - since the files are created using the .jpg format, how can I have the inherent file extension in my system so I can create a .vis formatted picture?

I want to add some assets (plugins) to my editor but cannot create one since I have no foundation file.

I found my .VIS files while looking through my phone's data files under the GUI section, so I also agree it's an image file. The question now is how to in fact open and edit it. GIMP can't and i'm not even going to bother with Photoshop.