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Mac (not MAC, it's not an acronym for anything) apps have a .app extension at the end of them. I am not sure what snowmonkey is smoking.
.dmg is a disk image (a notion Windows users have trouble grasping)
.sea is a self extracting archive which is like an app because it doesn't require another app to extract the compressed file it contains. I rarely see .sea anymore because developers release their apps on dmg's or they are compressed as plain stuffit archives or gz.
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