Reports With The Word Attachments In The Name

I thought I'd share this with you a) because I'm amazed, and b) to hopefully save anybody wasting the amount of time I did.

I created a report called 'Attachments by Account', and deployed it to reporting server. Then when testing it, I'd always get a File Download prompt for an html file, rather than the rendered content. After an enormous amount of messing with the report content, stripping out actions and hyperlinks and script etc., I uploaded a copy called 'aa' out of laziness, and it worked fine. Then I renamed it back to 'Attachments by Account', and I'd get the File Download prompt again. Remove the word 'Attachments' from the name and it works.

How on earth does something like that happen ?

p.s. This is SQL 2000 RS, sp 2. I've not got round to testing SQL 2005