Several XPS document handling program like the popular Pagemark XPS Converter possess the function of exporting XPS document to image format, including the BMP. The file resulting from xps to bmp conversion will be a picture that looks exactly like an opened XPS documents.
Articles and other information relating to xps into bmp conversion:
How to open, view and convert XPS and OXPS documents on Mac - Apps and on-line services for viewing and converting XPS, OXPS documents