eBook Files Extensions - What are ebook files and how do I open a ebook file?

What are ebook files and how do I open a ebook file?

File Type Category File Format
.azw eBook Files Amazon Kindle eBook File
.azw1 eBook Files Amazon Topaz eBook
.bkk eBook Files BookBuddi eBook File
.epub eBook Files Open eBook File
.etd eBook Files Adobe Reader EBX Transfer Data File
.fb2 eBook Files FictionBook 2.0 File
.gpf eBook Files GRAVITY Ragnarok Online Patch File
.gpx eBook Files GPS Exchange File
.kml eBook Files Keyhole Markup Language File
.koob eBook Files Koob E-Book File
.lit eBook Files eBook File
.lrf eBook Files Sony Portable Reader File
.lrs eBook Files Librie Reader Source File
.lrx eBook Files Sony Portable Reader File
.mart eBook Files MartView eBook File
.mbp eBook Files Mobipocket Notes File
.mobi eBook Files Mobipocket eBook
.prc eBook Files Mobipocket eBook File
.pup eBook Files PlayStation 3 Update File
.rzb eBook Files Red Zion Book File
.tk3 eBook Files TK3 Multimedia eBook
.tpz eBook Files Kindle Topaz eBook File
.tr3 eBook Files TomeRaider eBook File
.zvr eBook Files SAFA Media Audio File