To add PC file viewer to the CDE front panel, dtfile, dtpad, etc., do the following:
Open File Manager (dtfile)
Go to the /opt/SUNWdtpcv/bin directory.
You will see the PC file viewer icon there.
Open the CDE front panel where you want the icon.
For example, Application or File sub folder.
Drag and drop the PC file viewer icon from File Manager to InstallIcon in the selected subfolder.
Now the PC file viewer can be launched by just clicking on the icon in the CDE front panel. You can also promote the icon to appear on the front panel by default.