HFS the program itself can't handle some of the file names. if the file name has non utf-8 characters in it, HFS will be unable to send the file
there have been many users having issues, it a know bug/problem that doesn't have an easy or viable solution.
Meaning you have to use file names that contain alpha number numbers "a-z" 0-1"...

BUT, you can try with other html conventional means that change the language and encoding type:
Example:
http://www.w3.org/International/questions/qa-html-encoding-declarations.en<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
Since you are using ascii, you can try it, but there is no guarantee:
http://winrus.com/cpage_e.htmhttp://winrus.com/mix_e.htmhttp://www.w3schools.com/charsets/I would recommend this for you:
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-8">
Here is a helpful site that can help translate/encode for possible html support via meta tags:
(you would have to copy and paste it over back and forth manually ...
http://mashke.org/Conv/good luck