How to stop file type changing automatically

[marc]

Heyho,

My config file for gvim has been given the .html file type. This results 
in it being opened by Firefox, when opened via a file manager. Not what 
I want.

Taking a closer look, this behaviour occurs when the file contain a 
<script> entry. In other words, the file happily lives life as a text 
file type until an edit is saved containing the text "<script>", when 
it, immediately and without notification, automatically changes its file 
type to .html

How do I stop this from happening?

It reminds me of Microsoft's Clippy - but rather worse - because it 
doesn't tell me it's doing it, and it and doesn't give me the option top 
stop it.

For now, I've added a filename patterns to text/plain of .*, which might 
well be sufficient.

It also begs the question of when and where this changing is done. 
Frankly, I can't conceive of a time when I'd want this behaviour.

-- 
Best,
Marc