I am using GIMP for first time to make icons for touchscreen system. I have copied a screen icon from that design, made the edits and exported as bmp file as that is only image format this touchscreen program will open. received error message that bmp file "is not a valid 3.0 bmp format." I'm looking for a way to get this icon picture into a valid bmp format. Can I export to another format and then convert to bmp?