Fix all possible error conditions.
Reset the problem fixing settings to the default.
Remove files that are listed in a project but which don't exist.
Fix files that are filtered by the file filters.
Fix files that have incorrect case in a project file.
Fix files that are incorrectly specified in a project file.
Add files that are missing from a project file.
Remove files from obsolete version of Visual Studio.
Reset the problem fixing settings to off. List this before any other /fix settings then list at least one /fix setting to fix just that one problem.
Delete .tlog dependency files.