Some of the selected files are exclusive to %0. If you edit a file while it is exclusive, you may have to merge your changes ...

Some of the selected files are exclusive to %0. If you edit a file while it is exclusive, you may have to merge your changes manually or, if the file is binary, overwrite the latest database version when you next check in. If you choose to check out these files, you can look in the Output window to determine which files are exclusive. Do you want to continue?