DirBuild
From CometWiki
Comet Explorer Directory Rebuild
The Directory Rebuild program builds new QDIR files for the selected Comet directory. Right-click on the directory's name in Comet Explorer and select "Rebuild directory...".
Before the directory can be rebuilt it must be checked to be sure all the required information is available. Click "Scan for Errors" to begin the check. For any file that requires clarification, a popup dialog will prompt you for the details.
From there you have several choices:
If you want to update the properties of the file and have it included in the new QDIR, choose the file type from the drop-down menu, supply the record size and then the key size and position information if appropriate. Click OK.
If you want to skip this file because you don't know the properties you can click "Skip this file" however the directory rebuild will not be able to complete until you return and finish this file.
If you want Comet Explorer just to delete the file from the Comet folder, click "Delete". This does erase the actual file.
If you decide you want to cancel the directory scanning process, click "Cancel Scan". You will not be able to rebuild the directory until you complete the scanning process.