I downloaded the IDES4 package for my WK-3800 and it installed fine. I then changed the Directory in the File/Preference tab to point to a different file location which didn't start with the default folder ( ProgramData ). When I next executed MDMS, I got a message "Can't create data folder" and it pointed to the folder/file I had just edited and saved in the File/Preference tab. I couldn't get back into the app to fix my bad edit. So I uninstalled and reinstalled the IDES4 package. Still got the same error message pointing to the same bad folder/file. I uninstalled IDES4 again and also checked for any other possible files which might contain my bad edit. It was a pretty easy search since it's a new laptop and I had only loaded a few other files. Same result: same error message pointing to my original bad edit. The bad folder/file obviously still exists somewhere on my laptop, but I can't find it. Any ideas? Thanks for the help.