I am on a different system, but my guess is that:
1) the properties file should contain the lines
/*.cfm = cfusion
/*.html = cfusion
/*.htm = cfusion
2) you should save the file as uriworkermap.properties;
3) The intention now is to edit system file /WEB-INF/web.xml, by adding html and htm mappings to it. First and foremost, back-up the file, just in case.
Open the web.xml file in a text editor. Locate the elements whose IDs are of the form "coldfusion_mapping_x", where x is a number in the set {0,1,2,...}. Locate the highest such number. Let's call it X. The ID of a new ColdFusion mapping will therefore begin with X+1.
Now, edit the web.xml file by adding the following 2 new mappings immediately after mapping number X (replacing X with the actual value!):
<servlet-mapping id="coldfusion_mapping_X+1">
<servlet-name>CfmServlet</servlet-name>
<url-pattern>*.html/*</url-pattern>
</servlet-mapping>
<servlet-mapping id="coldfusion_mapping_X+2">
<servlet-name>CfmServlet</servlet-name>
<url-pattern>*.htm/*</url-pattern>
</servlet-mapping>
To illustrate, on my system the highest number in the IDs of the form "coldfusion_mapping_x" is 15. So, for me, X is 15. Therefore, if I followed the above instructions, I would have to add the following 2 mappings immediately after mapping number 15:
<servlet-mapping id="coldfusion_mapping_16">
<servlet-name>CfmServlet</servlet-name>
<url-pattern>*.html/*</url-pattern>
</servlet-mapping>
<servlet-mapping id="coldfusion_mapping_17">
<servlet-name>CfmServlet</servlet-name>
<url-pattern>*.htm/*</url-pattern>
</servlet-mapping>
Save the edited web.xml file.
4) Restart ColdFusion.