Convert wmf to otb

What is the difference between .wmf and .otb?

Description: Proprietary Windows graphic format developed by Microsoft; contains a series of drawing operations, including commands for drawing lines, circles, and rectangles; may also contain bitmap drawing operations; used primarily for vector images, but can also include raster graphics.; The OTB (Nokia Over The Air Bitmap Image) file format is a type of image file developed for use on Nokia mobile devices. These files are specifically optimized for efficient transmission and display on Nokia phones, particularly older models. The OTB format is designed to be compact to facilitate over-the-air (OTA) transmission, which was an essential feature in the era of limited bandwidth and data transfer capabilities. The format supports monochrome graphics, making it suitable for simple images like icons and logos.