I am trying to write my first AddIn in EPDM so I am starting simple. Basically I've followed the steps outlined in the Help File for creating a .Net AddIn. I created a right click menu option for my first AddIn that will display a message box. First, I tired adding the .dll to my test vault from my client computer and was given a registry error. Thinking this had something to do with my local permissions, I went directly to the server (logged in as administrator) and added it in there successfully. On my server, I can right click inside a vault folder and the AddIn is there, and runs correctly. Then I returned to my client computer and rebooted. Now when I right click in a vault folder I get an error: "Failed to register the COM DLL <local path to my addin dl filel>. Could not load file or assembly 'Interop.EdmLib, Version 22.214.171.124, ... cannot find the file specified."