When an extension is ran as UI extension, then the extension needs to explicitly support it. When run as a UI extension then the extension cannot access workspace files. We have an API proposal that enables an extension to access files through a file system provider.
https://github.com/microsoft/vscode-remote-release/issues/867#issuecomment-507044598
Would it be possible to make this extension compatible with https://github.com/microsoft/vscode-remote-release so that it can run as an ui extension?
Long explanation: