What Is the File Extension .APM?

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A file extension is a suffix located at the end of a filename which indicates file type. The file extension APM is primarily used to identify CAD/CAM, meta and certain media studio software files.

Format

  • Standard file extensions are usually two to four characters long, depending on type. For example, "myproject.apm" might be used by a CAD/CAM program to specify metafile mapping and scaling data.

Types

  • Software programs that utilize forms of APM (Aldus Placeable Metafile) file extensions include Alphacam, AutoPlay Audio Studio, ArcPad Mobile GIS and Windows Metafile image formats.

Origin

  • Placeable Metafiles were first developed by Aldus Corporation to specify how a metafile should be mapped and scaled on an output device. The Adobe Corporation now holds the patent on APM technology.

Identification

  • Some file formats have identifying HEX characters at the beginning of the file that can be used to verify file type. The HEX value for files with the .APM extension is "D7 CD C6 9A 00 00."

Compatibility

  • Since files with the .APM extension are not supported by Microsoft Windows API, to play back an APM file in Windows, first back up the file, open it with a hex editor, then remove the Placeable Metafile header starting at "offset 0x16."

References

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