RAILX - how to run on Windows
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1. Right-click this zip and pick "Extract All..." - Windows will not run a
   program from inside a zip.  (If you downloaded the launcher itself,
   RAILXUpdater.exe, there is nothing to extract - go straight to step 2.)
2. Run RAILXUpdater.exe - from the extracted folder, or from wherever you saved it.
3. The first time, Windows may say "Windows protected your PC". That is
   SmartScreen meeting a new build that is not code-signed yet: click
   "More info", then "Run anyway". It appears once per machine.

The launcher then fetches the current build from the RailX channel, checks
every file against its signed manifest and starts the app. Nothing else has
to be installed.

Check the file yourself, if you want to (PowerShell):
    Get-FileHash .\RAILXUpdater.exe -Algorithm SHA256
    <the hash in SHA256.txt>   <- both must be the same
