The File Extensions Database

.CFB File Extension

  • Developer by: Microsoft
  • Category: Data Files
  • Format: Binary

What is an .CFB file?

.CFB is Compound Binary File

A CFB file is a compound file that contains a structured file system. It is used to store objects, such as directories and multiple files, within a single file. Storage objects are used to represent directories and stream objects are used to represent files. A CFB file may also include metadata about the application that created the file.

Microsoft OLE applications, such as Office and Digital Image programs commonly use CFB files. OLE is a framework developed by Microsoft that enables applications to embed and link to documents and other objects. In other words, it enables a user to add data to a document from another application. An example is an image editor sending an image to a word processor.

CFB files are saved in the Compound File Binary Format (CFB or CFBF), a general purpose file format used to store data for OLE applications. It stores data in a file structure similar to the FAT file system and is divided into header, FAT, DIFAT, MiniFAT, Directory, Stream, and Range Lock sectors.

The structure of a CFB file provides efficient access to specific data within the file. For example, a single storage or stream object stored in the file may be accessed without needing to load the entire file. However, CFB files can grow large in size and may cause performance issues if there is not enough storage available.

NOTE: A CFB file is also known as an Object Linking and Embedding (OLE) Compound File (CF) (OLECF).

Programs that open Compound Binary File
Microsoft Visual Studio 2017

How to solve problems with CFB files

  • Associate the CFB file extension with the correct application. On :
    Windows: Right click on any CFB file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CFB files". Mac: Right click (or Ctrl-click) the CFB file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CFB is Compound Binary File. Because only the current version supports the latest CFB file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available .CFB is Compound Binary File update.
  • To make sure that your CFB file is not corrupted or virus-infected, get the file again and scan it with antivirus software.