You may find that if you have installed IRRICAD Version 20 as a new install, rather than upgrading an existing installation, that double-clicking on a DEZ file will no longer start up IRRICAD. In general, selecting the program to associate with DEZ files should work when selecting "Open With..." when right-clicking on a DEZ file.
However, if you are still having an issue follow the steps below:-
1. Download the zip file from http://www.irricad.com/irricad/download ... socV20.zip . Save the file to your hard-drive.
2. Extract the contents of the zip to any preferred location.
3. Locate the extracted files and right-click on the FileAssocV20.bat file and select the option “Run as Administrator”.
4. Now launch IRRICAD V20 by double-clicking on a .DEZ or .DES file.
The IRRICAD Team