Open APM File
The APM format and extension files serve as a metafile image created by some Windows programs.
Basically, the full name of the files that use the APM extension is Aldus Placeable Metafile, hence the acronym.
What is a metafile?
A metafile allows you to save content of various types in the same file, such as photographs, texts, vectors, and even sound and video.
In this case, APMs are originally designed to scale images on output devices.
Such APM extension files contain image and metafile header information, similar to the WMF file except that it contains a leading 22-byte header.
An important element to note is that APM files cannot be used natively by the Windows API metafile functions GetMetaFile(), CopyMetaFile(), and PlayMetaFile().
Software to open and work with APM files
GIMP: is a free and open source graphics editor based on layers and rasters used for image manipulation and editing, usually with professional and specialized tasks.
fCoder Group Image Converter Plus: By transforming groups of images from one file format to another, Image Converter Plus software works quickly with drawings, photos, graphics, and selected data files, simplifying every task.