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Windows10でガイドボタンが効かない件の対処
極悪なのがゲームバーがOFFの設定でもGuideボタンをOFFにする必要がある点。

1) Make sure that game recording is turned on using the method above.

2) Launch any game.

3) Press Windows key + G to open the game bar. It may ask you if you want to recognize the current application as a game if it doesn't recognize it.

4) Click on the cog on the far right of the bar to open a settings window.

5) Uncheck 'Open Game bar using (button) on a controller'. Should look like this: http://i.imgur.com/YSOzuou.png

6) Steam is now free to use the button in game. Do a little victory jig.