What is the SCM file format?
Files with the .scm extension store screen capture data created with the ScreenCam screencasting application for Windows. .scm is not a typical movie file - it stores a timeline of captured screen-region updates with timing data, plus optional synchronized audio narration, packed into a proprietary binary container with no published specification.
Older Lotus ScreenCam recordings captured frames by intercepting Windows screen updates in a proprietary format rather than encoding a standard video stream. .scm files can only be played back using dedicated ScreenCam software. Because the format is undocumented and proprietary, there is no published magic-byte signature; identification relies on the application association.
ScreenCam can be used for:
- Creating screen demos and tutorials,
- Simulating programs and workflows,
- Screencasting and online training,
- Recording software presentations.
ScreenCam was originally developed by Lotus Corporation and gained popularity in the 1990s due to its innovative approach to recording screen activity. It offered a simple, intuitive interface reminiscent of VCRs popular at that time. After Lotus was acquired by IBM, development continued until successive Windows versions gradually dropped support for the underlying capture technology, creating portability issues. IBM discontinued the project and sold the ScreenCam trademark to SmartGuyz Incorporated. SmartGuyz rebuilt ScreenCam from scratch using a newer approach based on image capture and mouse-movement playback, and the application once supported exporting recordings to SWF or standard video formats such as AVI. Both Flash/SWF and the ScreenCam application are now effectively legacy; recovering old .scm files may require locating an older ScreenCam build.
Security & safety
RISK: LOWA ScreenCam .scm is passive recorded media, not executable, so the file itself is low risk. The real cautions are practical: ScreenCam is abandoned legacy software, so be wary of downloading 'ScreenCam players' or '.scm converters' from random sites - they are a common vector for bundled adware/PUPs; prefer an archived copy of the genuine program. Also confirm what your .scm actually is, since the extension is shared with StarCraft maps and Scheme scripts (a Scheme .scm is executable code).
Format details
in a nutshell- StarCraft / StarCraft map (.scm) - Blizzard's original StarCraft uses .scm for campaign/melee maps (an MPQ-based archive); opened/edited in StarCraft or map editors, unrelated to ScreenCam.
- Scheme source code (.scm) - Plain-text source files for the Scheme/Lisp programming language (e.g. GIMP Script-Fu, Guile), edited in any text editor.
- SuperCard / app project (.scm) - Project/data files from SuperCard and various other apps have used .scm; niche and unrelated.
Programs that open SCM files
Windows2 apps
ScreenCam
Paid Open the .scm in the ScreenCam player/editor it was made with. ScreenCam is legacy software - if the official site is gone, you may need an archived build. (Verify the vendor site is live before recommending.) 
PowerPoint (legacy integration)
Paid Older PowerPoint could embed/play ScreenCam .scm via a plug-in; modern PowerPoint cannot - included only for legacy decks. Not a general .scm opener. Technical details
deep spec| Format type | Proprietary binary screen-capture movie (recorded screen-region updates plus optional audio) |
| Container | Proprietary ScreenCam container; no published specification or format documentation |
| Encoding | Binary; frame data stored as a sequence of captured screen-region updates with per-frame timing |
| Compression | Internal delta/region-update compression - only changed screen regions are stored per frame |
| Audio | Optional synchronized narration track; PCM at rates from 8 kHz to 44.1 kHz when present |
| Color depth | Matches the recorded desktop: 8-bit, 16-bit, or 24-bit depending on recording era |
| Resolution | Bounded by the captured screen or user-selected region; no fixed maximum |
| MIME type | application/octet-stream (unofficial alternative: video/x-screencam) |
| File signature | None publicly documented; no known magic bytes - identify by application association |
| Typical file size | Hundreds of KB to tens of MB depending on recording length and screen area |
| Format versioning | Internal version tied to the ScreenCam release; Lotus-era and SmartGuyz builds are mutually incompatible |
| Platform | Windows only |
| Export formats | ScreenCam could export recordings to AVI or SWF from within the application |
| Extension collision | .scm is also used by Scheme source files and other unrelated formats |
| Released | Lotus ScreenCam (1990s); later SmartGuyz ScreenCam |
SCM conversions
Community Q&A
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