Hi Jens,

Response of Klaas should do it. I'll post a snippet from our RT manager framework, on behalf of completeness: how to create a Visio file + how to set active page on Visio file

private void CreateAndAssignVisioFile(IEngine engine, int viewId, string VisioFile)
{
    if (CreateVisioFile(engine, $@"C:\\RTManager\\TestDependencies\{VisioFile}", VisioFile))
    {
        var assignRequest = new AssignVisualToViewRequestMessage(viewId, VisioFile)
        {
            ActiveValue = "Active",
            Page = "1",
        };

        // There is no way of knowing if this succeeded
        engine.SendSLNetSingleResponseMessage(assignRequest);
    }
}

private bool CreateVisioFile(IEngine engine, string filePath, string VisioFile)
{
    CreateProtocolFileMessage createProtocolFileMessage = new CreateProtocolFileMessage
        {
            What = 7,
            Ba = new BA(System.IO.File.ReadAllBytes(filePath)), 
            Sa = new SA(new string[1] { VisioFile })
        };
    CreateProtocolFileResponse createProtocolFileResponse = engine.SendSLNetSingleResponseMessage(createProtocolFileMessage) as CreateProtocolFileResponse;
    if (createProtocolFileResponse == null || createProtocolFileResponse.ErrorCode != 0)
    {
        engine.ExitFail("Could not upload visio file. " + ((createProtocolFileResponse == null) ? "response was null" : $"errocode was {createProtocolFileResponse.ErrorCode}"));
        return false;
    }

    return true;
}