Files that contain the .arc file extension are compressed archive files. These files are most commonly created as Macintosh Hierarchical File Systems or MS-DOS archives.
ARC files contain an archive of compressed files, allowing users to reduce the size of larger files or take volumes of multiple files and combine them into a single file archive.
This particular file format was very popular in the late 80s but the compression algorithm is now outdated and other file compression formats have taken its place as the newer file formats allow for greater compression of files, making the file sizes smaller and even easier to manage.
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If you have additional information about the ARC file format or software that uses files with the ARC suffix, please do get in touch - we would love hearing from you.