Sometimes my IE don't know how to handle HTML files

[gb]

Hi,
I've ran into something weird, a few times
when I updated my site and I start IE
to check it up pops a small filetransfer-window
asking me:
.HTML file do you want to open or download it?

If I answer open I get the question: with
what program?

The only solution to this is to upload
a previous copy of my index.html
One that i just saved locally,,,,,

Have anyone ran into this, or have an answer?

regards
Gunnar