What is a .ACF file?
ACF is a Steam manifest tracking an installed game - its App ID, name and size. Created by Steam.
- Did you know
- An ACF file is plain text in Valve’s KeyValues notation, the same syntax Steam uses for its VDF configuration files.
- Steam names each manifest after the game’s numeric App ID, for example appmanifest_730.acf, and it tracks install paths and update state.
- Steam writes an appmanifest .acf into its steamapps folder for every installed game, which is how it knows what to update and verify.
- What Analyser reads
- Parse Valve KeyValues files (VDF) and Steam app manifests (ACF) - appmanifest, libraryfolders, loginusers, and config - surfacing the App ID, name, install dir, size on disk, and the full key tree.
- Depth of analysis
- .ACF is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .ACF file
- Drag a .ACF file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
- Related formats
- .VDF. See all supported file types.