[ERROR] Error: spawn cmd ENOENT

[CepheidVariable]

Issue Description

No Intellisense features present
[ERROR] Error: spawn cmd ENOENT in the OmniSharp output log

I've tried adding "C:\Windows\System32" to environment path, but then I get an error in VSCode that OmniSharp needs .NET framework 4.7.2.

I tried adding "C:\Program Files\dotnet\sdk" to my path so OmniSharp would see my path to the .NET framework, but it has no effect.

Steps to Reproduce

open any C# project folder within VSCode from the File > Open Folder option.

Expected Behavior

Intellisense features present with no errors in output.

Actual Behavior

Intellisense features missing, error in output.

Logs

OmniSharp log

Starting OmniSharp server at 2/8/2021, 3:15:15 PM Target: d:\Users\Cepheid Variable\Documents\c_sharp\test

[ERROR] Error: spawn cmd ENOENT

C# log

dotnet --info .NET Core SDK (reflecting any global.json): Version: 3.1.302 Commit: 41faccf259

Runtime Environment:
OS Name: Windows
OS Version: 6.2.9200
OS Platform: Windows
RID: win8-x64
Base Path: C:\Program Files\dotnet\sdk\3.1.302\

Host (useful for support):
Version: 3.1.6
Commit: 3acd9b0cd1

.NET Core SDKs installed:
3.1.302 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

Environment information

VSCode version: 1.53.0
C# Extension: 1.23.9

Dotnet Information

.NET Core SDK (reflecting any global.json): Version: 3.1.302 Commit: 41faccf259

Runtime Environment:
OS Name: Windows
OS Version: 6.2.9200
OS Platform: Windows
RID: win8-x64
Base Path: C:\Program Files\dotnet\sdk\3.1.302\

Host (useful for support):
Version: 3.1.6
Commit: 3acd9b0cd1

.NET Core SDKs installed:
3.1.302 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

Visual Studio Code Extensions

Extension	Author	Version
code-runner	formulahendry	0.11.2
csharp	ms-dotnettools	1.23.9
indent-rainbow	oderwat	7.5.0
jupyter	ms-toolsai	2020.12.414227025
material-icon-theme	PKief	4.5.0
path-intellisense	christian-kohler	2.3.0
powershell	ms-vscode	2020.6.0
python	ms-python	2021.1.502429796
rainbow-brackets	2gua	0.0.6
rainbow-csv	mechatroner	1.8.1
vscode-color	anseki	0.4.5

[CepheidVariable]

After further reading it looks like it may have to do with OmniSharp being built for .NET framework 4.7.2, while the latest supported version for Windows 8 is .NET framework 4.6.

Is there a version of OmniSharp that works with .NET 4.6 that I can verify this with?

UPDATE:
I was able to find what looks like the last version before CORE 3, v1.18.1 and download the .vsix file. Unfortunately, this file doesn't seem to work, I instead unpacked the zip into my extensions folder. This has the extension show up in my installed list, however, it does not do anything. There is also no output option for OmniSharp.

Do I have any other options?

[JoeRobich]

@CepheidVariable Sorry you are running into this. Windows 8 is well outside of support. Also, OmniSharp depends on Roslyn which has also upgraded their packages to NET 4.7.2.

Do I have any other options?

Windows 10 may still allow a free upgrade from Windows 8. Or perhaps dual booting a linux partition could be a good solution.

[CepheidVariable]

Thank you for the additional info. Unfortunately, I'm unable to change my development environment at this time.