XML isn't an image
A .xml file stores text data — settings, coordinates, lists — not pixels. There's no image inside to extract, and a picture can't be saved as a XML data file.
Looking to turn a BMP into XML? Here's the honest answer — and the conversions that actually work.
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BMP is an uncompressed raster format that stores pixel data with no quality loss, producing large files. It is common on Windows.
BMP opens in most image viewers and editors on Windows and Mac.
No — XML is a data format, not an image, so there's nothing to convert. You can convert your BMP to PNG, JPG or TIFF instead.
XML is a text-based data format used for app settings and, with a matching image, sprite-sheet coordinates. It isn't a picture.
A sprite sheet is a .png + .plist pair. Use a texture packer (TexturePacker, Cocos2d) to pack or unpack them together; a single-file converter can't.