FileInfo.com


.CDF File Extension


File Type 1 Channel Definition Format  (Most common)
File Format File
Common? No
File Description Format used by Web publishers to offer frequently updated information as "channels;" distributed from a Web server to computers with compatible Web browser software installed.
Program(s) that open cdf files Mac / Windows: Netscape Navigator with Netcaster support

File Type 2 Common Data Format
File Format File
Common? No
File Description Scientific data format that can include scalar, vector, and multi-dimensional data arrays
Program(s) that open cdf files Windows: Unidata NetCDF; NcView

File Type 3 Content Definition File
File Format Standard File
Common? No
File Description XML-based data format designed for storing and sharing abstract Enterprise Content Management (ECM) content and metadata; can be used to exchange content across repositories and organizations.

The CDF format was originally defined as part of the Content Transformation Services (CTS) framework by the Enterprise Content Management Group (ECMG).
Program(s) that open cdf files Windows: ECMG Reader; ECMG Explorer

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