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WMF at a glance
WMF
The original WMF specification was published in the Windows 3.1 SDK documentation in 1992. Aldus Corporation independently added a 'placeable' header for device independence, which Microsoft later incorporated in Windows 2000. The format specification was republished in 2006 under the Microsoft Open Specification Promise.
ASF at a glance
ASF
ASF is closely tied to the Windows Media era of desktop streaming and downloadable online media.
Format comparison
| Feature | WMF | ASF |
|---|---|---|
| File type | Vector | Video |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1990 | 1996 |
| Inventor | Microsoft Corporation | Microsoft |
| Status | legacy | active |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Layer support | Not supported | Supported |
When to use each format
When to use WMF
- Your source file is already in WMF.
- Preserve source expectations before exporting to ASF.
- WMF is commonly used in vector workflows.
When to use ASF
- Your target workflow expects ASF.
- Improve delivery compatibility with ASF.
- ASF is commonly used in video workflows.
FAQs
Why convert WMF to ASF?
Convert to ASF when you need compatibility with older Windows Media infrastructures, enterprise archives, or inherited streaming libraries that still rely on Microsoft's classic container family.
It is useful for preservation and controlled legacy playback.
For current browser and consumer delivery, MP4 or WebM are generally better choices.
What changes when converting WMF to ASF?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to ASF adds layer support.
What should I review after converting WMF to ASF?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.