Running LMDE UDP 5, cinnamon DE. I installed the program maxview from a .deb package as it is not in the repositories. I created a launch item in the Menu. I am now trying to associate the program with .max files. (paperport files). The program does not show up as an option in the "Open With" menu. I didn't expect it to. However, the add button is grayed out. I tried going through "properties" of a .max file. but the add button only adds the highlighted program (programs already listed) to the default open with list. I've tried this as both user and with root privileges. How do I get the "Open With" menu to add this program to the list. I'm sure I just overlooked something simple.