General content descriptor
Encyclopedia
A General Content Descriptor (GCD) is a file which describes downloads like ringtones and pictures to wireless devices. GCD's are plain text
Plain text
In computing, plain text is the contents of an ordinary sequential file readable as textual material without much processing, usually opposed to formatted text....

 files. They are required by many wireless carriers to install applications on devices. The name of the file will end with a ".gcd" extension
Filename extension
A filename extension is a suffix to the name of a computer file applied to indicate the encoding of its contents or usage....

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