If you're using it as a voltage divider, you'll be hard pressed to get more than 0.09W into it, not 0.1W, and not even the 0.5W "package limit". It's only rated 300V.
If you're using it slightly differently, like, I don't know, driving current into the bottom resistor, as... a current mirror, or something? You'd be better off finding something that can handle a lot of power. 0.1% 100 ohm resistors aren't hard to find, maybe in higher wattages but there's probably something still.
Assuming this is a new circuit, not a mod, I find it hard to believe you can't "reduce the currents" somehow anyway.
Tim