Need help, I want to open HTML text with OOCalc from Firefox and I used

header("Content-Type: application/vnd.sun.xml.calc")

I think its a correct mime type for OOCalc, but why Firefox does not recognized it and always triggering OOWriter to run. I tried mozilla with the same result as Firefox.
Is there any other mime type for OOCalc ? are there any way to force firefox/mozilla to open openofice document in their (OO) original windows not in firefox/mozilla windows ?

for your information I am using suse9.3 and firefox 1.0.6

Thanks

FYZ