Apple Files Extensions - What are apple files and how do I open a apple file?

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

File Type Category File Format
.component Apple Files Mac OS X System Component
.data Apple Files Analysis Studio Offline Data File
.dist Apple Files Mac OS X Distribution Script
.dmg Apple Files Mac OS X Disk Image
.itl Apple Files iTunes Library File
.m4r Apple Files iPhone Ringtone File
.pk Apple Files Audition Peak File
.pkg Apple Files Mac OS X Installer Package
.qlgenerator Apple Files Quick Look Generator File
.sparsebundle Apple Files Mac OS X Sparse Bundle
.sparseimage Apple Files Mac OS X Sparse Image
.supp Apple Files iOS Application Archive File