Callback Technologies Vol. 1 2022 Update

This has been a very exciting quarter for us! We are happy to announce a new acquisition and two new product releases in addition to other updates.

  • Callback Technologies acquires ShellBoost (now CBFS Shell).
  • NEW: Cross-platform FUSE component for creating virtual filesystems in Windows and Linux.
  • Updates and improvements across the board.


CBFS FUSE provides a simple way to create and manage virtual filesystems for Windows and Linux. Create a virtual filesystem on Windows or Linux backed by any data source: database records, local or remote files, dynamically-generated content, or anything in-between.

  • Cross-Platform Support - Windows support is based on our flagship CBFS Connect product. Linux is supported through the widely adopted libfuse library.
  • FUSE-like API - Modeled after the traditional Linux FUSE API, the FUSE component offers a simple and familiar development experience.
  • Leverage Any Data Source - You have full control over the contents of your virtual filesystem, so you can use any data source your application has access to. It can be local or remote, a database or REST service, static or dynamically-generated, or something else entirely.

CBFS Shell

CBFS Shell, formerly ShellBoost, finds a new home in Callback Technologies complementing our many developer tools in the file virtualization space. See the press release for more information.

CBFS Shell allows you to create a custom experience for your users and define how they interact with files and folders from Windows Explorer. With the help of a Shell Namespace Extension you can fully customize the user experience. CBFS Shell is provided as an easy-to-use library that simplifies a wide variety of customization tasks. Supported operations include:

Product Updates

All products have been updated with a variety of new features. Notable updates include:

  • Support for Windows 11 (including ARM64).
  • Performance improvements.
  • Improved control over items' lifetime in the metadata cache.
  • Update handling of rename operations performed over reparse points or other drives.
  • Enhanced rule handling in CBFS Filter.
  • Metadata journaling enhancements in CBFS Storage.
  • Improved handling of FsCtl requests sent to the volume.