Arc File Extension
ARC represents ARChive and it is a file extension for compressed files.It may be opened with Winrar.
ARC file extension is an old compression method initally used for DOS. ARC files can comprises a Macintosh HFS archive or an MS-DOS archieve. Nowadays ARC files are not being used commonly. It can be open with many utility programs like ARC or WinRAR.
What needed to Open Arc file extensions.
Links about Arc file extension