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An OAM file is a zip file that packs all the necessary assets into an Assets folder, and includes some configuration information in an XML document.
Try replacing the extension of .oam to .zip, and see the content inside of it.
OAM(no idea why it's called oam) is an exention for "Animate Deployment Package" file. It's called "Deployment package" in Edge Animate because it packages edge animate composition that can be deployed to other Adobe products like Dreamweaver, InDesign, & Muse.
In Dreamweaver, the same file is called "Edge Animate Composition" because inserting this will bring the edge animate created composition into Dreamweaver.
While it's called "Animated Widget File" elsewhere, because it is of file type ""Animated Widget File", as you can see here: http://www.fileinfo.com/extension/oam
Hope it helps,
I also Googled and found this page about this OpenAjax, but with so many developers (and even Dreamweaver) steering away from Ajax, I thought it would just be a coincidence for Adobe to use a similar extension. But I've opened the buried XML file in the zipped .oam folder, and noticed indeed the widget xmlns="http://openajax.org/metadata" spec="1.0" in the code. So thanks for reassuring !
Still, it's a pity Adobe doesn't use a more consistent description of it in various applications.