.CPD File Extension
File Type 1RoboHelp Cache Project Database
What is a CPD file?
Database file created by RoboHelp, a program used for authoring Windows help documentation; stored as part of a RoboHelp project (.XPJ) and contains cached information for the project; should not be opened or edited manually.
CPD files are saved in a Microsoft Access database (.MDB or .ACCDB) format and can be opened with Access. However, this is not recommended since RoboHelp uses the data in the background for caching and it could cause the program to malfunction.
NOTE: Your project cache can be cleared each time you open a help project by choosing the "Clear project cache (.cpd) before opening any project" option in the General tab in the application preferences.
File Type 2Compressed PhotoDefiner Image File
.CPD File Association 2
Compressed image format used by PhotoDefiner, a program used for enhancing and compressing digital imaging content; incorporates lossless compression that uses the "new bytes value representation" theoretic approach and the LZMA library; permits up to 30% more compression than a similar .PNG file.
CPD lossless compression can be used to re-compress PNG files.