What are these .rar / .a0* files and how do I extract them?
Like .zip, they are compressed file formats: .rar files are WinRAR format, and .a* files are ARJ–. Please note that WinZip does not extract ARJ files automatically, unless you install ARJ as a helper program. Even so, it may not extract multiple ARJ files (i.e. those that end with .a00, .a01, etc.) unless you change the program options. Also, most CD-rips come with an .NFO file, e.g. RAZOR.NFO and so on. These files contain instructions for unzipping, installing, and running the game, so read them when you see them. These rips were done by various groups, and although we don’t condone their actions, we are grateful that they did these rips, because otherwise games risk being lost forever. In Windows, .NFO file looks like a file with magnifying glass on it). You CANNOT left-click to read it, since Windows will mistake it as a Windows info file and attempt to read it that way. Instead, open it from Notepad or a proper .NFO viewer.