Opening an FB File

The FB file type is primarily associated with CoffeeCup Form Builder.

FB	File extension: FB
	File type:	versatile container

What is an FB file

FB files mostly belong to CoffeeCup Form Builder. An FB file does not belong to a single, uniform format. Its internal structure varies depending on the application that created it.
For example:

Form Builder Files: These use a ZIP format to store data for CoffeeCup Form Builder projects. They contain the elements needed to design and deploy web forms. For more details, visit CoffeeCup.

FictionBook Files: Here the file uses an XML layout to hold ebook or flip book content. Such files are often managed with readers or converters like Calibre.

Database Files: Some FB files serve as Firebird database files, holding structured data after configurations by systems like Visual FoxPro. More information is available at Firebird SQL.

FlatBuffers Binary Files: Several FB files use the FlatBuffers binary format to serialize data. This variation is seen in game data (as with Free Fire or Cataclysm: Dark Days Ahead) and other applications. Check FlatBuffers for details.

Scientific, Image and Annotation Files: A few FB files include oceanographic wave buoy data, JPEG images (or even animated GIFs from Photoshop used as Facebook profile pictures), and gene annotation data from FlyBase (FlyBase).

FilExt.com note: The actual purpose and the tool required to open your FB file depend on its internal structure. Inspect the file using a text or hex editor to see if it begins with markers like those of ZIP archives, XML declarations, or binary signatures.

How to open an FB file

You need a suitable software like CoffeeCup Form Builder to open an FB file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your FB file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a FB file directly in the browser:. Just drag the file onto this browser window and drop it.

Online FB Text Viewer

Choose your .fb file to analyze

or drag and drop it here

Online File Viewer

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FB file format:

If you know the file format, you can also find out how to open or edit the file. The file format can be deduced from the file extension and the signature. Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Below you will find our evaluation of the FB files:

The FB file extension includes many different file formats. The following file formats are most commonly found in FB files:

• 10% of all FB files internally use the ZIP format, i.e. an FB file contains several compressed files. The 15 to 100 compressed files are called container.data, counters.data, payments.data, settings.json, theme.data, validation.data and \files\. If you want to see the included files and images, simply rename the file extension to .zip and double-click it. FB files are between 500 KB and 4 MB in size. Certain words are almost always found in the files, such as files/PK, files/assets/PK and files/assets/skin/PK.
• 10% of all FB files save the data in XML file format. The Extensible Markup Language (XML) is a simple text-based format for representing structured information: documents, webpages, data, configuration, books, transactions, invoices, and much more. XML defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. These files contain neither text nor words, but only data. The file size is in the range of 500 bytes to 24 MB. Several words can almost always be found in the files, e.g. <?xml version="1.0" encoding="UTF-8"?>, FictionBook, http://www.w3.org, xmlns, <project>, <videoskin>01</videoskin> and templatename. These files are attributed to movie and bilyk.

The remaining 80% of all FB files are files with no common format, often e.g. GIF. Often described as startup, screen, avatar, config, items or wdesc. You can get all the details of your FB file by dragging it onto this page or by clicking the button "Choose your .fb file to analyze" above.