Cities: Skylines (Steam) - Launching this game failed

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Apr 17, 2021
  • Cities: Skylines
Describe your issue
Launching this game failed

What is your game version?
I can't seem to find this, but it has had all the updates

What expansions do you have installed?

What mods are you using?

Please explain your issue is in as much detail as possible.
I have installed, uninstalled, reinstalled city skylines and it has taken me such a long time to finally get this far. It wouldn't open, saying error with download files, missing files etc. anyway after sorting that out, I finally install the paradox launcher - erorrs with that. I then install it and seems to be working fine until I launch the game, and it comes up with the red exclamation in a triangle saying it can't launch the game - but with no further details.

I checked online and many refer to issues with anti virus - but this is not the case. I have also seen a troubleshooter for uninstalling paradox and deleting some leftover files. I've done this and tried again, but I still get the same error. I have tried running as administrator, tried running the actual game file, I get an error message saying the file or directory is corrupted, (attached)

I have verified game files in steam and this all seems ok. Anyone have any ideas?

Not an issue with the laptop, virus software, or running games. I have Sims 4 on Origin with most DLC packs installed.

I am installing and trying to run this from an external harddrive. I also have Planet Zoo on Steam which also runs and was installed with no issues on the same external harddrive. Not an issue with size of files or memory/space either, as it is a huge external harddrive.

Can you replicate the issue? If yes, please explain how you did it.

Attachments File(s) attached


  • Launch.jpg
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The Full Monty Python
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Jun 29, 2001
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That second screenshot seems to show that cities.exe itself is corrupted. What about if you delete that file then run a Steam verify operation, which will replace it with a good one?