ArcFS
From Just Solve the File Format Problem
ArcFS is an archiver for RISC OS, claimed to have similar functions to Spark and to have a free read-only (de-archiver) version, so that you don't have to buy anything to open archives created in the ArcFS format.
The (rather over-used) .arc file extension is used, even though the format is not compatible with the various other formats for various other platforms that have also used this extension. On RISC OS systems, files in this format typically have a filetype of 3FB (ArcFSArc).
Identification
Some files begin with (hex) bytes 41 72 63 68 69 76 65 00.
Another possible signature is 1A 61 72 63 68 69 76 65.
Sample files
- APDL Public Domain CD 2 contains many files in ArcFS format
