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An AET file is typically used as a master template in After Effects, letting users open it and save a fresh project each time to preserve the template, and it contains the full design of the animation—compositions, timelines, layer structures, keyframes, effects, expressions, cameras, lights, render settings, along with organizational components such as folder layouts and interpretation rules.

What an AET generally does not contain is the full media; instead it stores links or paths to footage, images, and audio kept elsewhere, which explains why templates are often zipped with a Footage or assets folder and why missing-file prompts appear if media was relocated, plus the fact that AETs can depend on certain fonts or plugins means opening them on a different computer may cause missing-effect messages until everything is installed, and since file extensions aren’t exclusive, verifying the file’s "Opens with" setting or checking its source location is the most reliable way to confirm its creator and needed companion files.

An AEP file is the standard AE project where you build and edit animations, updated as you import footage, adjust comps, and refine effects, while an AET is a template meant as a reusable starting point, so the practical difference is workflow: you reopen an AEP to keep editing the same project, but you open an AET to create a new project so the template stays untouched.

That’s why AET files are often preferred for template-based motion graphics (intros, lower-thirds, slideshows): the master AET stays unchanged while each new project starts by opening it and doing a Save As to create your AEP, where you modify text, colors, logos, and media, and although both formats include the same elements—comps, layers, effects, keyframes, expressions, cameras/lights, and settings—and both rely on external footage paths, the AET is meant for safe templating and repeatable output, while the AEP is the editable project you keep refining.

An AET file normally contains the structural and behavioral blueprint of an After Effects project rather than the actual media, including compositions with resolution, frame rate, duration, and nesting, plus the complete timeline layout with layers for text, shapes, solids, adjustment items, precomps, and placeholders, alongside properties like position, scale, rotation, opacity, masks, mattes, blending modes, parenting, and all animation data—keyframes, easing, markers, and expressions when used.

Beyond that, the template keeps track of your effects and their parameters, from color correction and blurs to glows, distortions, and transitions, as well as any 3D configuration with cameras, lighting, and 3D layer options plus render/preview settings, and it also preserves project organization like folders, label colors, and interpretation settings, though it usually doesn’t pack raw media, audio, fonts, or plugins—only file paths—so opening it elsewhere may cause missing-footage or missing-plugin alerts until dependencies are restored In case you have just about any concerns relating to wherever along with how you can work with best app to open AET files, you possibly can call us at our web site. .