Drawing (or vector image) created with CorelDRAW; proprietary format used by Corel software and is not recognized by most image editing programs; if opened in CorelDRAW, the file can be exported in other more compatible formats.
CDR files can also be opened by Corel Paint Shop Pro, but for best compatibility, Corel recommends saving the CDR file as version 9.0 or earlier in CorelDRAW.
Adobe Illustrator may be able to open CDR files created with CorelDRAW 10 or earlier.