Edit in word with a Korean character as Confluence page title result document does not exist error

When edit a Confluence page with the option Edit in word with a Korean character as Confluence page title. will result a document does not exist warning pop up.

Steps to replicate

1. Direct yourself to a page
2. Create a new page with the following title:

   소스 보기
   

3. Save the changes
4. Now use the option Edit in Word via Tools >> Edit in Word

Snapshot of the error:

This issue can be replicate using:
Firefox 3.0.x and Firefox 3.5.5
WebDAV 1.0.3 Firefox plugin

However, there is no problem editing a Confluence page in word with umlaut character as the title of the page.