bom - Bill of Materials
To see the contents of a "Archive.bom" drop it on File Juicer and look in the folder for extracted text files.
As bom files has a list of files it refers to File Juicer will follow this list and process them too. It can generate an index of the files found so you can see the images imstalled.
For more direct access to info on bom files start the Terminal app in Applications/Utilities and type the command
man 5 bom