[These instructions are for Windows 10.] If eAuditor is properly installed, you can do the following from the “Open with” screen (right click on the icon to open the “Open with” screen). Click on “More apps” at the bottom of the list. If you have an option at the bottom of the list for “Always use this app to open .aud files” check it off. Click on “Look for another app on this PC”. Navigate to “C:\Program Files (x86)\NBCSA eAuditor”. Then select “NBCSA eAuditor.exe” as the program. If eAuditor is not present in the folder “C:\Program Files (x86)\NBCSA eAuditor” the.