Install a PDF writing program that has a feature to convert PDF files to BMP format. Many commercial programs with this feature are available, but there are several free programs available as well.

It is a nice file converter that supports the conversion of different file types. Using it, you can also convert JXR to PNG, JPG, PDF, BMP, GIF, and many more file formats.

It can rather convert multiple PDF files to major image formats like JPG, PNG, BMP, TIF, PCX, GIF, TGA, and 35 other less common formats. PDF To JPG Expert has a very basic and easy to use interface.