Contribute uses a variety of special files that aren’t intended to be viewed by visitors to your site:
The shared settings file, which has an obfuscated filename with a CSI extension, appears in a folder named _mm in the root folder of the site, and contains information that Contribute uses to manage the site
Older versions of files, in folders named _baks
Temporary versions of pages, so that users can preview changes
Temporary lock files, indicating that a given page is being edited or previewed
Design Notes files containing metadata about the site’s pages
In general, you shouldn’t edit any of these Contribute special files using Dreamweaver; Dreamweaver manages them automatically.
If you don’t want these Contribute special files to appear on your publicly accessible server, you can set up a staging server where Contribute users work on pages. Then periodically copy those web pages from the staging server to a production server that’s on the web. If you take this staging-server approach, copy only web pages to the production server, not any of the above-listed Contribute special files. In particular, don’t copy the _mm and _baks folders to the production server.
Occasionally you might need to manually delete Contribute special files. For example, there might be circumstances in which Contribute fails to delete temporary preview pages when the user is finished previewing; in that case, you would have to manually delete those temporary pages. Temporary preview pages have filenames that begin with TMP.
Similarly, under some circumstances an outdated lock file may be accidentally left on the server. If that happens, you must manually delete the lock file to allow others to edit the page.