FileInfo.com - The File Extensions Resource

.C2D File Extension

File Type	WinOnCD Disc Image
File Format	File
Common?	No
File Description	Copy of a CD created by WinOnCD, a disc imaging program created by Sonic Solutions and later published by Roxio; stores an exact copy of the data from a CD and may be used for duplicating or backing up discs.
Program(s) that open c2d files	Mac: Roxio Toast Windows: Roxio Creator; IsoBuster; EZB Systems UltraISO; MagicISO

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/c2d