The files are not replaced and I get no message about it either. When I run an uninstall I get a message if there are any files in use, but it looks nothing like the FilesInUse dialog.
I tought that the InstallValidate action checked if the files are in use and if so called the dialog. I added InstallValidate to the User Interface sequence because it was already in the Execute sequence and that did not help.
Please help!