What is a cvd file and how do I open a cvd file?

ClamAV virus definitions files are stored in the CVD format, and these files are appended with the .avd extension. A file with the AVD extension is used by the ClamWin software for updating the virus definitions in its current database with the new definitions provided by the developer of this application for its users. The ClamWin program is an anti-virus software developed by Sourcefire to offer users with system protection functionalities. Virus definition databases of most system security applications are updated by data files called virus definitions files. The ClamAV application also uses files in the CVD format, and this is an anti-virus program also offered as an open source application. The content of these CVD files is also called a digitally signed tarball which may contain one or more databases for the virus definitions provided by the developer. There are versions of the ClamAV software developed for Microsoft Windows systems and Linux platforms. 

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