2217 DiskDoubler Aggregate DiskDoubler is a data compression utility for the Apple Macintosh. Individual files are compressed by the software, but their file system details do not change, meaning files subject to DiskDoubler compression retain their original names, including file extensions. As such DROID and other PRONOM-based file format identification tools may report file format mismatch for DiskDoubler-compressed files. 220 The Church of Jesus Christ of Latter-Day Saints / The Church of Jesus Christ of Latter-Day Saints 26 Sep 2020 26 Sep 2020 fmt/1399 PUID 1773 DiskDoubler BOF: 0xABCD0054 1 Absolute from BOF 0 0 ABCD0054