You can define any number of extensions that DMC will recognize as 'usable' to open a table directly with a double-click from Windows Explorer.
We recommend that you use DMC Viewer to open all your .TPS, .DAT and .DBF files. With most versions of Microsoft Windows this is done through "Default Programs". Search Windows help for "Set Program Access and Computer Defaults" for more information. You can also open Windows Explorer then Right-Click on a file then select Open With. From there you can select or search for the program you want to associate with that file extension.
You can also link other extensions to those three types of files within DMC. For example, you to have your application save your TPS files with the .CGF extension. Follow the instructions above to make DMC.EXE the default program for that extension, then go into DMC and add an Extension with the Parent being TPS and the Extension as CGF. Once done you will be able to double-click on the .CGF file and have it open in DMC Viewer. DMC will also see them as TPS files and open them accordingly when you're working inside DMC.
Enter the 'Extensions' module from the navigation panel
You will find yourself in this screen:

Use the Main Frame's Insert button, or right click inside the browse to add a new extension (all is done in Edit In Place mode)
Start by entering the type of Parent File to link your new extension with (ONLY use 'tps' or 'dat' or 'dbf')
Then select the 'EXT' column and enter the extension to associate (for example 'dmc' WITHOUT any dot or quotes as in this example)
Now from within Windows Explorer, select any file whose extension is linked in DMC (see above) and do a right-click on it then use the 'Open with' command and select Data Management Center in the dialog box (you may have to use the browse button to retrieve dmc.exe from your installation directory)
From then on all these files will show in Window Explorer like DMC 'linked' and a double-click will open up DMC for you to access the File.