I'm using build 6000 of vista (64 bit) and version 7.6k.16386 of IE7 (32
bit) .

Recently, file type defaults for certain files - eg .mpg or .m3u will no
longer open and launch the correct programs.

Instead I get a box that politely says "The file you are downloading cannot
be opened by the default program. It is either corrupted or it has an
incorrect file type. As a security precaution, it is recommended that you
cancel the download" then links to some useless help topic.

Naturally, I've tried to restore the default file type settings in 'control
panel' - > 'default programs' but this doesn't seem to solve it.

Any ideas?

TIA