estcmd gather -cl -fx .doc,.xls,.ppt H@estfxmsotohtml -fz -ic UTF-8 -sd -cm casket.
These programs are called as filter programs when construting an inverted index. Their functions are to read data from a file specified with the first argument, and convert the data to document draft or html, and write the result to a file specified with the second argument.
estfxasis just passes input contents to output.
estfxmantotxt converts manual pages into plain text, so that it is expected to use "T@" prefix for estcmd filter spec. It depends man, bsdmainutils and coreutils.
estfxmsotohtml converts MS-Word, MS-Excel or MS-PowerPoint into html, so that it is expected to use "H@" prefix for estcmd filter spec. It depends on wvWare, xlhtml or ppthtml.
This manual page was written by Fumitoshi UKAI <email@example.com>, for the Debian project (but may be used by others).