| B1 Compressed Archive | |
| Catalina Group | |
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B1 file format is used by Freeware Archiver, a free digital data archiving software tool. Freeware Archiver is available for both desktop and mobile operating systems, but is not as popular as other similar tools.
B1 files use an effective LZMA compression method and support AES 256 encryption. Developers of B1 format state that data archiving process is very fast. Freeware Archiver offers a smooth and intuitive user interface and is available for free for both commercial and personal use.
| .a00 | Split Multi-volume ARJ Compressed File Archive (part 2) |
| .a01 | Split Multi-volume ARJ Compressed File Archive (part 3) |
| .a02 | Split Multi-volume ARJ Compressed File Archive (part 4) |
| .ace | WinACE Compressed Ace Archive Format |
| .alz | ALZip Compressed Format |
| .ar | Linux/Unix Command Library Format |
| .arc | ARC Lossless Data Compression And Archive Format |
| .arj | ARJ Compressed Archive Format |
