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About ACM Files

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An .acm file is an audio file saved in the Interplay ACM format, a compressed audio format developed by Interplay Entertainment for use in its video games. The file stores voice, sound effects, or music data using a form of adaptive differential pulse-code modulation (ADPCM) compression, allowing games to include high-quality audio while keeping file sizes small enough for CD-ROM or disk-based distribution.

The ACM format was used in several classic PC games from the 1990s, including Fallout, Baldur’s Gate, and Descent. It allowed developers to efficiently stream and manage in-game audio without requiring excessive memory or processing power. Although rarely used today, .acm files may still appear in game archives or fan restoration projects, and various playback and conversion tools can extract or decode their audio content.

Converting ACM Files

You can convert .acm files to other formats to make them easier to use or edit:

  • Converting to MP3: Makes ACM audio compatible with most players and devices, though it applies another layer of lossy compression that may slightly reduce sound quality.
  • Converting to AAC: Offers better compression efficiency than MP3 with similar audio quality, making the files easier to play on modern devices while keeping file sizes relatively small.

About FileHelper.com

FileHelper.com is a free web-based file utility that can open Interplay Audio files and over 150 other file formats directly in your web browser. It displays file properties, including metadata, and image EXIF data, along with information about the corresponding file type. FileHelper.com can also view and convert images to several common formats. Have an unknown file or a file without an extension? No problem — FileHelper.com can identify over 15,000 file types.

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