1433 Microsoft Compiled HTML Help Text (Structured) This is an outline record only, and requires further details, research or authentication to provide information that will enable users to further understand the format and to assess digital preservation risks associated with it if appropriate. If you are able to help by supplying any additional information concerning this entry, please return to the main PRONOM page and select ‘Add an Entry’. 195 Artefactual Systems Inc / Artefactual Systems Inc 14 Feb 2014 This format is identifiable via a container signature in DROID 6 and later. 14 Feb 2014 application/vnd.ms-htmlhelp MIME fmt/634 PUID chm File extension chw File extension 961 Microsoft Compiled Help file BOF: ITSF (Info-Tech Storage Format) 1 Absolute from BOF 0 0 49545346