Nuget_credentialproviders_path -

$env:NUGET_CREDENTIALPROVIDERS_PATH="C:\NuGet\CredentialProviders"

/opt/nuget/credentialproviders/MyProvider Windows (Command Prompt) nuget_credentialproviders_path

set NUGET_CREDENTIALPROVIDERS_PATH=C:\NuGet\CredentialProviders nuget_credentialproviders_path

C:\NuGet\CredentialProviders\MyProvider.exe Or on Linux: nuget_credentialproviders_path