RISC OS filetype

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== Format details ==
 
== Format details ==
A number of RISC OS archive formats have a 32-bit "load address" field, and the filetype might be contained in this field. Apparently, if the three high nibbles are all 0xf, then the next three nibbles contain the file type. Formats that have such a field include [[ArcFS]], [[Spark]], [[Squash (RISC OS)|Squash]], and [[ZIP]] (in extra field #0x4341).
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A number of RISC OS archive formats have a 32-bit "load address" field. If the three high nibbles of this field are all 0xf, then the next three nibbles contain the filetype.[https://www.riscosopen.org/wiki/documentation/show/FileSwitch%20Key%20Features#load_execution] Formats that have such a field include [[ArcFS]], [[Spark]], [[Squash (RISC OS)|Squash]], and [[ZIP]] (in extra field #0x4341).
  
 
Sometimes, when a RISC OS file is transferred to a foreign system, its filetype is appended to the filename, separated with a comma.
 
Sometimes, when a RISC OS file is transferred to a foreign system, its filetype is appended to the filename, separated with a comma.

Latest revision as of 20:50, 10 January 2020

File Format
Name RISC OS filetype
Ontology

RISC OS filetype, or Acorn filetype, is a system of 12-bit file type identifiers used on RISC OS. It is essentially the RISC OS equivalent of a filename extension. A filetype is usually written as three hexadecimal characters, like "FF9".

[edit] Format details

A number of RISC OS archive formats have a 32-bit "load address" field. If the three high nibbles of this field are all 0xf, then the next three nibbles contain the filetype.[1] Formats that have such a field include ArcFS, Spark, Squash, and ZIP (in extra field #0x4341).

Sometimes, when a RISC OS file is transferred to a foreign system, its filetype is appended to the filename, separated with a comma.

[edit] Lists of filetypes

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