I had the same problem before I found how to fix it.
Here is the windowsxp solution:
1. Go to controlpanel
2. Open add or/and remove program
3. And on your left side you should have four choices, choose the bottom one.
4. Then you should see three downpoint arrows with a sentence in the window
5. Choose the bottom arrow and there you can make k-meleon default html or htm.
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