.UVU file extension

To open .UVU files on Windows, right-click the .UVU file → Open with → choose a reputable media player that can open MP4 files (select “More apps” if needed).

To open a .UVU file, try a desktop video player that can open MP4 containers and use “Open with” to select it explicitly. If it still won’t play, the file may rely on UltraViolet/DECE packaging/DRM expectations, so try another player or move the file to a desktop system for troubleshooting.

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Last updated: June 10, 2026

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .UVU files

Use these platform-specific instructions to open .UVU files safely.

Windows

Right-click the .UVU file → Open with → choose a reputable media player that can open MP4 files (select “More apps” if needed).
If it fails to play, try importing/opening it in software that supports UltraViolet/DECE MP4 workflows (or try a different MP4-capable player).
If you suspect the file is not a DECE/UltraViolet video, check where it came from and try opening it in the application that created it.

Full Windows guide

Mac

Control-click the .UVU file → Open With → pick a media player that can open MP4 container files.
If it won’t open, try a different desktop player and confirm the file is actually an UltraViolet/DECE CFF video (based on its source).

Full Mac guide

Linux

In your file manager, choose Open With and select an MP4-capable media player.
If playback fails, try another player and verify the file source (UltraViolet/DECE CFF vs. an unrelated “.uvu” usage).

Full Linux guide

iOS

iOS may not recognize .uvu directly: open it in the Files app and use Share/Open In to send it to a third-party video player app that can open MP4-like files, or transfer the file to a desktop for troubleshooting.

Full iOS guide

Android

Android may not recognize .uvu directly: open it in Files/Downloads and use Open with/Share to try a video player app; if it still fails, transfer to a desktop player for better diagnostics.

Full Android guide

Security notes

Treat .uvu files as potentially untrusted multimedia: video parsers can have vulnerabilities, so prefer well-maintained, reputable media players and keep them updated.
Be cautious with unexpected .uvu downloads or email attachments; if the sender or origin is unclear, don’t open it just to “see what it is.”
Avoid changing the extension to .mp4 as a “fix” when the source is unknown; instead, verify the file’s provenance because the extension can be spoofed.

Can't open this file?

These are the most common causes and fixes when .UVU files fail to open.

Common reasons

The file won’t play even in MP4-capable players
Windows opens it in the wrong app (or asks what to use every time)
The file is mislabeled or has an ambiguous meaning
Playback has audio/video issues or errors

Fix steps

Try at least one other reputable desktop media player that supports MP4 containers and codecs.
Confirm the file’s origin (e.g., UltraViolet/DECE workflow vs. an unrelated program using .uvu).
If possible, obtain the file again from the original source to rule out corruption.

Recover a deleted or lost .UVU file

If the file was deleted by mistake or the drive was formatted, data recovery software may be able to get it back. Stop writing to that drive right away, because new data can overwrite what you want to recover.

MiniTool Power Data Recovery

Windows software that recovers deleted or lost files from PCs and external drives such as HDDs, SSDs, USB drives and memory cards, after deletion, formatting or a crash.

Wondershare Recoverit

Windows and Mac software that recovers deleted or lost files from computers and external drives such as HDDs, SSDs, USB drives and SD cards.

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OS-specific troubleshooting

What is a .UVU file?

.UVU is defined by UltraViolet/DECE specifications as a Common File Format (CFF) video file that uses the media type video/vnd.dece.mp4 and the filename extension .uvu. Technically it is MP4-based, but it may be used within the UltraViolet ecosystem where packaging rules (and potentially protected content workflows) can affect compatibility compared to ordinary .mp4 files.

Background

The .uvu extension is tied to UltraViolet/DECE’s Common File Format (CFF), which standardizes an MP4-based file format for distribution and playback within the UltraViolet ecosystem. The specification explicitly maps the .uvu extension to the IANA-registered media type video/vnd.dece.mp4.

In many real-world situations, a .uvu file behaves like an MP4 container and may open in common media players; however, compatibility can vary depending on how the file was produced and whether a given player recognizes the DECE/UltraViolet profile. UltraViolet documents also mention a closely related extension, .uvvu, alongside the same general family of DECE MP4 media types.

Note that some third-party sites also describe a different meaning for “.uvu” (for example, associating it with “Movie Maker Video Data”). Because the UltraViolet/DECE specifications explicitly define .uvu for DECE MP4, that is the primary and most standards-backed identification. If your file came from a Movie Maker–related workflow, treat that as a separate, less certain possibility and verify the file’s origin before choosing software.

Common MIME types: video/vnd.dece.mp4

Common .UVU issues

The file won’t play even in MP4-capable players

.UVU is MP4-based but may follow UltraViolet/DECE rules that some players don’t support, or the file may not actually be a DECE/UltraViolet video despite the extension.

Try at least one other reputable desktop media player that supports MP4 containers and codecs.
Confirm the file’s origin (e.g., UltraViolet/DECE workflow vs. an unrelated program using .uvu).
If possible, obtain the file again from the original source to rule out corruption.

Windows opens it in the wrong app (or asks what to use every time)

The .uvu extension is uncommon, so the OS may not have a default association.

Use “Open with” to pick the app you want.
Set that app as the default for opening .uvu files in your system’s file association settings.

The file is mislabeled or has an ambiguous meaning

Some references describe .uvu as something other than an UltraViolet/DECE MP4 file, which can lead to choosing the wrong software.

Check where the file came from (download/service/device/software) and what it was supposed to contain.
If it is not from an UltraViolet/DECE context, try opening it with the creating application or consult that tool’s documentation.

Playback has audio/video issues or errors

Even if the container opens, unsupported codecs or damaged data can cause stutter, missing audio, or failure mid-playback.

Test on another desktop player to isolate player-vs-file issues.
If you control the source, re-export or re-download the file to rule out incomplete transfers.

FAQ

Is .UVU just an MP4 file?

It is MP4-based, but .uvu is specifically defined by UltraViolet/DECE as a Common File Format file mapped to the media type video/vnd.dece.mp4, and some players may not recognize it the same way they recognize .mp4.

What MIME type is associated with .uvu?

UltraViolet/DECE specifications map .uvu to the MIME type video/vnd.dece.mp4 (registered with IANA). IANA also lists related vendor types including video/vnd.uvvu.mp4.

Can I fix it by renaming .uvu to .mp4?

Renaming doesn’t convert the file. Some players may open it after renaming, but it can also mislead troubleshooting; it’s better to use “Open with” and confirm the file’s source and format.

Why do some sites say .uvu is “Movie Maker Video Data”?

There are competing/ambiguous claims online. The most standards-backed definition is the UltraViolet/DECE mapping of .uvu to video/vnd.dece.mp4; if your file came from a Movie Maker-related workflow, verify that origin and use the creating software.

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