CFB files are created when Disk Drill can’t determine for sure if the recovered item is XLS, XLSX, DOC, DOCX, PPT, PPTX or other MS Office file after a Deep Scan.
CFB stands for “Microsoft Compound File Binary”. If you come across such files after successful recovery, try renaming them with the file type they originally were:
- Right-click on the document and select Get Info.
- Click the arrow next to Name & Extension.
- Change the name so that it ends with a period and the correct file extension. For instance, if you know it should be a Microsoft Word document, change it to “filexyz.docx” (or “filexyz.doc” if you’re working with an older version of Word) and close the window.
- When the dialog box pops up, confirm that you want to change the extension.
- Double-click on the file to open it.
We are working on improving our file type detection algorithms. Based on our tests, in 90% of recovery scenarios Disk Drill is able to detect the correct type of the MS Office file. But if you get a CFB file, renaming it often solves the problem. If it doesn’t, it’s possible that the recovered file was corrupted. See Troubleshooting Scan Results for more information on opening recovered files.