Boot information file
BIF is a file extension for a boot information file. BIF files contain information to boot a computer from a CD or DVD. BIF files can be opened and used by disk authoring software such as MagicISO and UltraISO. BIF files allow you to create a customized boot disk as needed.
Learn more about .BIF files:
Visit the MagicISO web page.
Read about Boot Initialization at ITKnowledgeExchange.com.