(Last updated 11 April 2006) Name : anatoly techtonik Email : techtonik&php.net MIME media type name : Application MIME subtype name : Vendor Tree - vnd.ms-htmlhelp Required parameters : None Optional parameters : None Encoding considerations : binary This media type may require encoding on transports not capable of handling binary. Security considerations : This data is an archive of interlinked HTML and supplementary files to be displayed by special program which in turn usually uses browser component installed on user machine. Format is native for Microsoft Windows help files. Windows HTMLHELP uses Internet Explorer browser component to display the data. Therefore every security issue that applies to the way Internet Explorer handles HTML files and associated content also applies to the handling of this media type. Files may not be displayed correctly if loaded from untrusted sources (such as network drive). Digital signatures can be used to ensure the data came from trusted party. Interoperability considerations : Published specification : Applications which use this media : Windows standard help file. Used by majority of windows applications. Displayed via standard Windows system htmlhelp component. Additional information : 1. Magic number(s) : (4, 'ITSF') 2. File extension(s) : chm 3. Macintosh file type code : chm 4. Object Identifiers: application/octet-stream Absence of CHM format in IANA is a blocker for web accessibility - http://issues.apache.org/bugzilla/show_bug.cgi?id=37798 File format description http://www.speakeasy.org/~russotto/chm/chmformat.html Person to contact for further information : 1. Name : anatoly techtonik 2. Email : techtonik&php.net Intended usage : Common For windows applications and system help, references, eBooks and other documentation. Compiled from many .html files. File format is binary. It has table of contents, index and search capabilities. Author/Change controller : (File created 11 April 2006)