Once an archive has been opened, you can perform various operations on the files inside the archive. By right-clicking on a file within the archive, or selecting a file and using the Action menu, you can choose what you want to do:
View will open the file in the default viewer program.
Open With... allows you to open the file in a program you choose.
Edit With... will open the file a program you choose. The difference between this and Open With... is that any changes you make will be saved to the file in the archive.
Delete will remove the currently selected file(s) from the archive.