Archive Files Extensions - What are archive files and how do I open a archive file?

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

File Type Category File Format
.a00 Archive Files ALZip Second Split Archive File
.ar7 Archive Files AR7 Archive File
.bar Archive Files Age of Empires 3 Data File
.blb Archive Files Blob Data File
.c00 Archive Files WinAce Split Archive File
.c01 Archive Files WinAce Split Archive Part 1 File
.c32 Archive Files Syslinux COM32 Module
.car Archive Files Car Explorer Data File
.daa Archive Files PowerISO Direct-Access-Archive
.gcz Archive Files Compressed GameCube/Wii ROM
.h2o Archive Files Battle Realms Game Data File
.kz Archive Files KuaiZip Compressed File
.pit Archive Files PackIt Compressed Archive
.rgss2a Archive Files RPG Maker VX RGSS Encrypted Archive
.tar Archive Files Consolidated Unix File Archive
.tgz Archive Files Gzipped Tar File
.txz Archive Files XZ Compressed Tar Archive
.uha Archive Files UHarc Compressed Archive