René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"-UseWindowsPowerShell:$false not respected in New-PSSession","articleBody":"### Prerequisites\r\n\r\n- [x] Write a descriptive title.\r\n- [x] Make sure you are able to repro it on the [latest released version](https://github.com/PowerShell/PowerShell/releases)\r\n- [x] Search the existing issues.\r\n- [x] Refer to the [FAQ](https://github.com/PowerShell/PowerShell/blob/master/docs/FAQ.md).\r\n- [x] Refer to [Differences between Windows PowerShell 5.1 and PowerShell](https://learn.microsoft.com/powershell/scripting/whats-new/differences-from-windows-powershell).\r\n\r\n### Steps to reproduce\r\n\r\nThis is a sub-issue of #25242.\r\n\r\nThe cmdlet `New-PSSession` does not respect explicit `$false` values for the `-UseWindowsPowerShell` switch parameter.\r\n\r\n```powershell\r\nPS\u003e $session = New-PSSession -UseWindowsPowerShell:$false\r\nPS\u003e $session.Runspace.ConnectionInfo.ShellUri\r\n```\r\n\r\n### Expected behavior\r\n\r\n```console\r\nPS\u003e $session = New-PSSession -UseWindowsPowerShell:$false\r\nPS\u003e $session.Runspace.ConnectionInfo.ShellUri\r\nhttp://schemas.microsoft.com/powershell/Microsoft.PowerShell\r\n```\r\n\r\n`-UseWindowsPowerShell:$false` should behave the same as omitting the `-UseWindowsPowerShell` switch, creating a session with the default PowerShell endpoint.\r\n\r\n### Actual behavior\r\n\r\n```console\r\nPS\u003e $session = New-PSSession -UseWindowsPowerShell:$false\r\nPS\u003e $session.Runspace.ConnectionInfo.ShellUri\r\nhttp://schemas.microsoft.com/powershell/Microsoft.PowerShell.Workflow\r\n```\r\n\r\n`-UseWindowsPowerShell:$false` behaves the same as `-UseWindowsPowerShell` or `-UseWindowsPowerShell:$true`, creating a session with Windows PowerShell 5.1 endpoint.\r\n\r\n### Error details\r\n\r\nNo error is thrown. The cmdlet executes but ignores the explicit `$false` value.\r\n\r\n### Environment data\r\n\r\n```powershell\r\nPS\u003e $PSVersionTable\r\n\r\nName                           Value\r\n----                           -----\r\nPSVersion                      7.5.4\r\nPSEdition                      Core\r\nGitCommitId                    7.5.4\r\nOS                             Microsoft Windows 10.0.26100\r\nPlatform                       Win32NT\r\nPSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}\r\nPSRemotingProtocolVersion      2.3\r\nSerializationVersion           1.1.0.1\r\nWSManStackVersion              3.0\r\n```\r\n\r\n### Visuals\r\n\r\n_No response_","author":{"url":"https://github.com/yotsuda","@type":"Person","name":"yotsuda"},"datePublished":"2025-11-17T14:07:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/26464/PowerShell/issues/26464"}