Cannot upload knowledge item to an opportunity

Symptoms
 When trying to upload a file as a knowledge item on an opportunity: The file upload never completes, just a blank screen is returned after clicking save.
 
Reason
When one of the keywords listed below is found in query string, the asp response is aborted and hence page just hangs.

"IFRAME"
"JAVASCRIPT"
"EMBED"
"OBJECT"
""<"SCRIPT">""
""<"IMG"

These entries are reserved words that cannot be used in any name.

Resolution
Remove these words from the name of the opportunity and you will be able to attach a word document and save it