Downloading and extracting Dreamcast games
Most games available from internet sites are packed using WinRar and have the extension .RAR
Download WinRar from http://www.rarlabs.com
ACE files are used by some minor groups or personally repacked games. ACE files are WinACE compressed files, and their file extensions in succession are .ACE, .C00, .C01, and so on. WinACE compressed files will NEVER have .C00 or .C01 as their starting files.
NFO files included with the games are the groups' text files and release information. These files are readable with Notepad or any other plain text editor, and give useful notes and information on the game's release. NFO files are not necessary to burn the games, but sometimes contain crucial instructions needed to burn the game.
SFV files are also usually included with the games... these files are plaintext files with CRC error checking information. They're used to determine if archive files have been corrupted, or if there are files missing. Without the SFV files, the only way to see if the game archive is good is to unarchive it. If no error messages are returned, the archive is fine. SFVs are not necessary to burn the games.
ZIP files are sometimes included with the release, these usually contain scans of the CD covers, the CD itself, game manuals, or other supplemental game information.