using the stable and the beta builds i have never had that issue, for example, having hfs in the root of c:/webroot/hfs.exe
and a basic html page of home.html (c/webroot/home.html) coding:
<html>
<head>
</head>
<body>
<p> test </p>
</body>
</html>
--------------------
in hfs right click the home/house and click add file chose c/webroot/home.html
hfs is now sharing the page:
the path would be
http://xxx.xxx.xxx.xxx/home.htmland or you can right click on the house (or create a new empty folder/add a real folder) and go to properties different template and paste the html code there...
The error you are recievein is either a user error or a naming error and if it is a naming error, right click it and rename it to something easier...