Illegal characters in path.

I found the solution, described here on Stack Overflow: https://stackoverflow.com/questions/65281107/visual-studio-2019-illegal-characters-in-path

The problem I had was that there was an empty entry in my user PATH. (Shown in the ‘Environment Variables’ dialog as one entry starting with a ‘;’ semicolon). I fixed that, quit Visual Studio and started it again (restarting it didn’t work), and then the problem went away.

I have the same issue as the OP.

I am using Visual Studio Pro 2022, 17.9.3

Trying to create a project using the "Angular and ASP.NET Core" template.

I get: Illegal characters in path.

It creates some folders and a .sln file, but the .sln file is empty

there are no files in the folders it creates.

I have 2 different machines exhibiting the same problem except that I'm using .NET 9.0 Winforms. A brand new project in a folder path with no spacing and no illegal characters and a short full path produces the same "Illegal characters in path." message and the designer will not open it. The only solution I found was to change the Visual Studio IDE options to use the legacy method for building folder paths internally. You can either manipulate the <AppContextSwitchOverrides> config setting within devenv.exe.config adding in Switch.System.IO.UseLegacyPathHandling=false; to the string value, or you can set this via registry:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\AppContext]
"Switch.System.IO.UseLegacyPathHandling"="false"

There's very few posts about this but the relevant ones are from users running Visual Studio 2022 complaining about the same thing. Fresh install, repair, .NET repair don't fix the issue.

I had same error, i used dotnet command line:

dotnet new angular -o MyAngularApp

I have the same problem, using Visual Studio 2022 17.11.4 (64-bit).

I’m trying to add a new Angular App project to my existing solution, but all I get is the error message ‘Illegal characters in path.’ No file or directory is written to disk.