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Ouch - 100m through walls! You're going to need a router/ap with a replaceable antenna and you'll need a third party antenna. You'll have to play around with it a little. it's impossible for someone here to say "100m, that's around 6dBi of gain". Buy the router/ap first, find your range, then buy an antenna with somee gain and a decent return policy.
There used to be switches on the market that had BNC connectors and would effectively bridge the media types. I doubt they're still common, however Black Box will have something for sure.
An alternative to a black box approach (which might be expensive) is to add an RJ45 NIC to the server (if there is not RJ45 interface in there already) and have W2k route between the two networks. Your AP can hang off the W2k server. If you get a router/AP you can choose not to use the routing functionality so don't avoid a router based on a cost decision.
There are also some routers on the market now that are using extended range technology. If you choose to get one of those, ensure that you understand the issues around replacing antennae on these units (or, if there ARE any issues).
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