Filetypes are used as a last resort by Harvest-NG, when no appropriate MIME summariser can be found for the file. They are used to map between the extension that the file was sent with, and a supported mime-type.

For example, the file-types section of a file could look like:

<Filetypes>
htm	text/html
html	text/html
shtml	text/html
ps	application/postscript
</Filetypes>