Not a bad idea But it wouldn't work. MVFU intelligently resizes based on the image size - so for example, it knows that a certain pixel size with be a VX Ace character set - that way, it knows roughly where the sprite edges will be, what the best type of resizing algorithm will be to do a certain part of the algorithm etc. So, although you can 'trick' MVFU into accepting your images, results will be unpredictable; in all likelihood it basically won't work very well (especially for tilesets - these may be laid out drastically differently to what it's expecting so things are very very likely to get weird!). I am adding support for new image types over time though, so the more 'unsupported' image type reports I get, the more support it will get over time. My plan is eventually to have it supporting basically everything you can throw at it... but it does take time to work out the best algorithm tweaks for each and every image type!