.WM file extension
To open .WM files on Windows, right-click the .WM file and select 'Open with'.
.WM files are video files that require compatible software to open. Use a trusted app on your device to access them.
Last updated: March 19, 2026 · Reviewed by Julian Stricker
What “reviewed” means on this page
- Format fit: whether the “what is this file?” description plausibly matches common real-world use of the extension, including category, typical MIME types, and aliases.
- Opening paths: whether Windows / macOS / Linux steps read plausibly for current OS dialogs and default apps. Not every step was tested on every OS version.
- Security framing: whether risk notes match the extension class (for example executables vs plain data) and whether affiliate wording does not contradict the security section.
- Sources and further reading: external links should point to vendors, standards bodies, or other primary references where possible; not every detail is individually sourced.
- Limits: this is clarity and safety-messaging QA, not a guarantee that every statement is exhaustive or that every binary you download is harmless. Pages without “Reviewed by” have not been through this editorial pass yet.
Full methodology in the Imprint — The Imprint also states where AI is used and what that does—and does not—replace.
Open on your device
Choose your operating system for a dedicated step-by-step opening guide.
How to open .WM files
Use these platform-specific instructions to open .WM files safely.
Windows
- Right-click the .WM file and select 'Open with'.
- Choose Windows Media Player or another compatible app.
Mac
- Control-click the .WM file and select 'Open With'.
- Choose a compatible app like VLC Media Player.
Linux
- Right-click the .WM file and select 'Open With'.
- Choose VLC Media Player or another supported app.
iOS
- Open the .WM file from Files and tap 'Share'.
- Select a compatible app like VLC for iOS.
Android
- Locate the .WM file in Files or Downloads.
- Open it with a trusted app like MX Player or VLC.
Security notes
- Only open .WM files from trusted sources.
- Use antivirus software to scan files before opening.
- Avoid executing scripts or macros within .WM files unless verified.
Can't open this file?
These are the most common causes and fixes when .WM files fail to open.
Common reasons
- File does not open
- Playback issues
Fix steps
- Install or update a compatible media player.
- Ensure the file is fully downloaded and from a trusted source.
- Try opening the file on a different device or platform.
Recover a deleted or lost .WM 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.
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 RecoveritWindows 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
Convert .WM to other formats
Use conversion tools to change .WM files into formats your software supports.
What is a .WM file?
.WM is a video file format associated with Windows Media technology. It is designed for video playback and streaming, often used in multimedia applications.
Background
.WM files belong to the Windows Media format family, which was developed by Microsoft to provide a comprehensive solution for video and audio streaming. The format is part of the Advanced Systems Format (ASF) container, which supports synchronous multimedia data. WM files are often used in professional and consumer video editing software, particularly in environments where Windows Media Player is the default player. Due to its proprietary nature, .WM files are primarily supported on Windows platforms, although third-party software can enable playback on other systems. The format is known for its efficient compression, making it suitable for streaming over the internet.
Common MIME types: video/x-ms-wm
Further reading
Authoritative resources for more details on the .WM format.
Common .WM issues
File does not open
The application needed to open the file is missing or the file is corrupted.
- Install or update a compatible media player.
- Ensure the file is fully downloaded and from a trusted source.
- Try opening the file on a different device or platform.
Playback issues
The video may not play smoothly due to codec issues or system performance.
- Install the latest codec pack for your media player.
- Close other applications to free up system resources.
- Try playing the file in a different media player.
FAQ
Can I convert a file to .WM by renaming it?
No, renaming a file does not change its format. Use a conversion tool instead.
Is it safe to open .WM files?
Yes, if they are from a trusted source and opened with reputable software.
What software can I use to open .WM files on a Mac?
VLC Media Player is a popular choice for opening .WM files on macOS.
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