Apache Lucene compound data
File type: Various data file
A cfs file is a compound index file created by Apache Lucene, a software library for full-text indexing and search.
It combines multiple files belonging to a Lucene index segment into one binary file.
Found 7 different file type records with the same cfs filename suffix.
File type category:
Various data file
Date updated: October 12, 2026
Apache Lucene is an information retrieval library from the Apache Software Foundation. It provides full-text indexing and search features for applications and runs on Microsoft Windows and other platforms through Java.
A cfs file stores the compound data for one Lucene index segment. Lucene creates it as part of its index-management process, alongside the other files that make up the index.
The file is an internal component of a Lucene index rather than a document intended for direct reading. Applications can also use non-compound segment files.
A cfs file should normally be accessed by the Lucene-based application that created the index. It is a binary index component and is not intended to be opened directly in a text editor or general-purpose file viewer.
On Microsoft Windows, use the associated Lucene-based application to access the complete index.
A cfs file is not normally converted by itself. It is one component of a Lucene index, so conversion tools must work with the complete index rather than with this individual file.
An application can read the index through the Apache Lucene API and export the indexed content or rebuild it in another index format. This produces new data; it does not convert the individual cfs file directly.
Software applications that handle other tasks involving cfs files:
Microsoft Windows
File type category:
Various data file
Date updated: September 27, 2017
The cfs file extension is associated with the Apple Safari web browser for Apple Mac OS X and Windows operating systems, based on WebKit layout engine, developed by Apple Inc. The .cfs file stores various data used for internal purposes of the Safari browser.
It is not possible to open the csf extension files.
Files with cfs extension are not convertable.
Software applications that handle other tasks involving cfs files:
Microsoft Windows
Apple macOS / Mac OS X
File type category:
Source code and script file
Date updated: September 28, 2017
The cfs file extension is associated with the ChatFactory instant messaging IRC client for Microsoft Windows operating system. The .cfs file stores script used to automate tasks in the ChatFactory. Probably obsolete product.
Use ChatFactory program to open the cfs extension files.
Files with cfs extension are not meant to be converted.
Software applications that can open cfs files:
Microsoft Windows
Software applications that can edit cfs files:
Microsoft Windows
Software capable of saving cfs files:
Microsoft Windows
Software apps that create cfs files:
Microsoft Windows
File type category:
Archive and compressed file
Date updated: February 28, 2019
Record marked as obsolete and not updated for a long time.
The CFS file extension is associated with the Compact File Set (CFS) an open archive file format and software distribution container file format.
Basic CFS files are compatible with ISO files. It is intended to be similar enough to ISO-9660 that many systems and applications will be able to read CFS, and other applications will require only minor modifications.
Mime types:
application/x-cfs-compressed
File type category:
Configuration file
Date updated: October 12, 2026
Record marked as obsolete and not updated for a long time.
The cfs file extension is associated with applications and devices developed by INMOS, a British semiconductor company.
INMOS was active during the 1980s and the first half of the 1990s. STMicroelectronics acquired the company in 1994.
The cfs file contains configuration data for the associated INMOS software or device.
Open a cfs file with the original INMOS software or device environment that created it. These tools and systems are obsolete and may no longer be readily available.
Conversion to another file format is generally not applicable because the INMOS cfs file stores configuration data rather than a document.
For a migration, the settings generally need to be recreated in a compatible INMOS environment, if one is available.
File type category:
Various data file
Date updated: September 27, 2026
Nero Burning ROM is software from Nero AG for creating, copying, backing up and burning CD, DVD and Blu-ray discs. A CFS file contains various data used internally by the application.
The file is a supporting file for Nero Burning ROM rather than a disc image or a user document. Its contents are intended for use by the Nero software.
CFS files are associated with the Windows version of Nero Multimedia Suite.
Open the file with Nero Burning ROM on Microsoft Windows. CFS files are internal Nero data files and may not provide a user-openable document when opened directly.
If Nero created the file as part of its internal data, leave it in its original location and allow Nero Burning ROM to use it.
A CFS file is not normally converted. It stores internal data for Nero Burning ROM rather than audio, video or a disc image intended for export.
To create a usable disc or disc image, open the relevant project or source data in Nero Burning ROM and use the application's burn or disc-image options instead of converting the CFS file itself.
Software applications that handle other tasks involving cfs files:
Microsoft Windows
File type category:
Various data file
Date updated: February 21, 2019
Record marked as obsolete and not updated for a long time.
The cfs file extension is associated with the CFS Console, a software for Microsoft Windows that allows users to install and manage computer games developed by Zaplots.
The cfs file stores some kind of data used by CFS Console.
Probably not meant to be accessed by the user.
Probably cannot be converted to anything else.
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