src/vs/workbench/services/dialogs/browser/abstractFileDialogService.ts/AbstractFileDialogService/addFileSchemaIfNeeded
class AbstractFileDialogService:	protected addFileSchemaIfNeeded(schema: string, _isFolder?: boolean): string[] {
		return schema === Schemas.untitled ? [Schemas.file] : (schema !== Schemas.file ? [schema, Schemas.file] : [schema]);
	}