Document opening links in WSL

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+# WSL
+
+## Opening links in a Windows browser
+
+Create `~/.local/bin/x-www-browser` with the following content:
+
+```
+#!/bin/sh
+
+/mnt/c/Windows/explorer.exe "$@"
+true # ignore exit code so xdg-open works correctly
+```
+
+Ensure that the file is executable.
+
+`xdg-open` uses `x-www-browser`.