What is the file extension for a Mac Application. Is it dmg, osx, sea or something else?
Which MAC application are to talking about....just because a software was designed for MAC that doesn't mean they will have the same extension........check out this site for file extension:
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.