The File Extensions Database

.CPD File Extension

  • Developer by: Adobe Systems
  • Category: Database Files
  • Format: Binary

What is an .CPD file?

.CPD is RoboHelp Cache Project Database

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.

Programs that open RoboHelp Cache Project Database
Adobe RoboHelp
File Type 2 Compressed PhotoDefiner Image File
Developer by: RGB Light Category: Raster Image Files

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.

Programs that open Compressed PhotoDefiner Image File
Apple QuickTime Player with the PhotoDefiner component
Apple QuickTime Player with the PhotoDefiner component

How to solve problems with CPD files

  • Associate the CPD file extension with the correct application. On :
    Windows: Right click on any CPD file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CPD files". Mac: Right click (or Ctrl-click) the CPD file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CPD is RoboHelp Cache Project Database. Because only the current version supports the latest CPD file format. Search, therefore, e.g. on the Adobe Systems manufacturer website after an available .CPD is RoboHelp Cache Project Database update.
  • To make sure that your CPD file is not corrupted or virus-infected, get the file again and scan it with antivirus software.