You can specify a prefix, a suffix, or both, for format-based names of HTML output files:
[StyleFilePrefix]
; doc format = prefix to use (if any) for file name in para content
parafmt=splitfileprefix
[StyleFileSuffix]
; doc format = suffix to use (if any) for file name in para content
parafmt=splitfilesuffix
If you are splitting files at Heading1 paragraphs, for example, you could specify the following properties:
[HTMLParaStyles]
Heading1=Split Title FileName
If a given instance of Heading1 consists of the text “Getting Started”, the resulting HTML filename would be ugGettingStarted03.htm.
You can use macros and macro variables (see §37.1 Defining and invoking macros) in sections [StyleFilePrefix] and [StyleFileSuffix].