BackPicture.PropData header format

Dear all,
I have a fr3 file with this picture, I would like to know what is the significant of this header
BackPicture.PropData="04446174610A7EBF01000A544A504547496D6167656FBF0100FFD8FFE000104A46494600010101006000600000FFDB00

This propdat present a JPG file but I would like to modify some aspects, please could you describe me the meaning of the header?
BackPicture.PropData="04446174610A7EBF01000A544A504547496D6167656FBF0100

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Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.