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An AEP file is commonly the project format for After Effects, acting as a blueprint instead of a playable video by storing compositions, various layer types, animation elements such as motion cues and expressions, effect settings, masks, mattes, plus 3D items like cameras and lights, and it generally holds only links to your source media so the file remains light despite the project relying on large external footage.

Because AEP files don’t embed footage, After Effects can throw "missing clips" warnings if you relocate or rename the assets or copy only the AEP to another computer without its media, making Collect Files—or manual gathering of all referenced items—the safest way to move a project, and if an AEP won’t open in AE, details such as where it originated, what’s stored beside it, Windows’ "Opens with," or a quick text-editor look can reveal if it’s a standard AE file or something from another software vendor.

When an AEP won’t show its media on another machine, it’s typically because it’s meant to point to external assets rather than include them, and After Effects stores absolute paths to footage, images, audio, and proxies, so if you move the project to a system with different directory names, drive mappings, or missing files, AE will open the project but show Missing/Offline Media until you relink the content.

A project may appear "broken" despite having the footage if the new system is missing fonts—leading to text reflow—or third-party plugins—causing effects to show as missing—or if an outdated After Effects version can’t process newer features, and the reliable remedy is to transfer via Collect Files or copy everything exactly as-is, then relink footage so that once fonts, plugins, and file paths align, the project usually resolves itself immediately.

An AEP file acts as a compact database for your After Effects project, which is why it can store an entire motion-graphics setup without matching the size of your footage, capturing details about comps—their resolution, frame rate, duration, nesting, and background—along with every timeline layer and its transforms such as position, scale, rotation, opacity, blend modes, mattes, parenting, and timing, plus animation elements including keyframes, easing, motion-blur settings, markers, expressions, and full effect setups, as well as masks or roto shapes with their contours, feather, expansion, and animated points.

If you are you looking for more info regarding AEP file technical details have a look at our own internet site. When 3D features are active, an AEP contains camera setups, light configurations, 3D layer parameters, and render options, as well as organizational metadata like bins, label colors, interpretation rules, and sometimes proxy info, but it typically excludes the footage—MP4s, MOVs, images, and WAVs are stored separately—so the AEP serves as the design map and the file-location references to those assets, meaning misplaced files trigger missing-media prompts.