CVF File

What are CVF files and how to open them

Are you having problems opening a CVF file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CVF files.

What is a CVF file?

CVF files have multiple uses, and Jet-VoiceMail Audio Data is one of them. Read more about the other uses further down the page.

Jet-VoiceMail Audio Data

Jet-VoiceMail Audio Data files store voice recordings made with Cowon Systems' JetVoiceMail software and related JetAudio/iAUDIO devices. They are used for saving short messages, memos, or voicemails that are recorded through JetVoiceMail's microphone-based recorder. These files are not general music-files but are for personal voice content, often being sent via email or embedded in a "voice file + player" executable.

Recorded by JetVoiceMail, the file format compresses voice data using voice-optimized compression methods so that voice files are smaller than uncompressed audio, with options in the software to choose higher or lower quality depending on compression ratio. JetVoiceMail supports sound effects (echo, reverb, etc.) and can convert recordings into formats or executable packages that include a playback module so the recipient need not have JetVoiceMail installed.

These files begin with the eight ASCII bytes "COWONVF" at the start of the file, identifying them as belonging to the Jet-VoiceMail format.

How to open CVF files

Important: Different programs may use files with the CVF file extension for different purposes, so unless you are sure which format your CVF file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested four different CVF openers which you will find listed below.

Last updated: September 19, 2026

All known file formats using extension .CVF

While Jet-VoiceMail Audio Data is a popular type of CVF-file, we know of 2 different uses of the .CVF file extension. Different software may use files with the same extension for different types of data.

Train Simulator Cab View File

Train Simulator Cab View files store settings that define how a driver's or engineer's view inside a train's cockpit or cab appears in Microsoft Train Simulator and compatible simulations such as Open Rails. They control which textures are used, how controls and gauges are placed on screen, what parts of the 3D cab are visible, camera positions, and how the view should behave when looking around from the cab. This format is used so that each locomotive's visual interior and instrument display works consistently with its configuration.

These files are produced by content creators or modders using text editors and are written in a human-readable scripting syntax defined originally by Microsoft Train Simulator. They are referenced from each locomotive's configuration file, often an .ENG file, using a statement such as CabView ("...filename.cvf") to tell the simulator what cab layout to display. When a locomotive offers both 2D and 3D cabs, the format also ensures that the correct view is selected, and camera positions are set in 3D models via matching filenames. The simulator reads the cvf file at load time to position graphics, windows, gauges, and define controls for driver interaction.

Various apps that use files with this extension

These apps are known to open certain types of CVF files. Remember, different programs may use CVF files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

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