[Bug]: System.ArgumentException: The path is not of a legal form.

Is there an existing issue for this?

[x] I have checked the existing issues for an existing issue. I even actually looked at the ones that are pinned to the top!

Operating System

Windows 10

CKAN Version

1.35.2

Games

KSP 1

Game Version

1.12.5

Did you make any manual changes to your game folder (i.e., not via CKAN)?

Manually installed mods previously with no problems.

Describe the bug

Any attempt to launch CKAN results in the following command line almost immediately, this has only started happening since I updated.

(I swear it's different to #3495)

Unhandled Exception: System.ArgumentException: The path is not of a legal form.
   at System.IO.Path.NewNormalizePath(String path, Int32 maxPathLength, Boolean expandShortPaths)
   at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
   at System.IO.Path.GetFullPathInternal(String path)
   at System.IO.DirectoryInfo.Init(String path, Boolean checkHost)
   at CKAN.NonSteamGame.NormalizeDir(String appPath)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext()
   at System.Linq.Enumerable.<ConcatIterator>d__59`1.MoveNext()
   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at CKAN.SteamLibrary..ctor(String libraryPath)
   at CKAN.GameInstanceManager..ctor(IUser user, IConfiguration configuration)
   at CKAN.CmdLine.MainClass.Execute(GameInstanceManager manager, CommonOptions opts, String[] args)
   at CKAN.CmdLine.MainClass.Main(String[] args)

Config file below.

Steps to reproduce

Any attempt to launch.

Relevant log output

{
  "AutoStartInstance": null,
  "DownloadCacheDir": "C:\\Users\\Owner\\AppData\\Local\\CKAN\\downloads",
  "CacheSizeLimit": null,
  "RefreshRate": null,
  "Language": "en-US",
  "GameInstances": [
    {
      "Name": "Auto KSP",
      "Path": "C:/Program Files (x86)/Steam/steamapps/common/Kerbal Space Program",
      "Game": "KSP"
    }
  ],
  "AuthTokens": {},
  "GlobalInstallFilters": [],
  "PreferredHosts": []
}

KSP-CKAN / CKAN

[Bug]: System.ArgumentException: The path is not of a legal form. #4245