Remote desktop services activex client control IE 11

You could unregister the control with

regsvr32 /u badboy.ocx

at the command line. Though i would suggest testing these things in a vmware.

Seems the original issue had nothing to do with the signature of the file, but in the implementation of IObjectSafety. For IE to allow it to be loaded, I needed to properly implement that interface, and it worked fine (even without a valid signature).

Simple example:

[ComImport()]
[Guid("CB5BDC81-93C1-11CF-8F20-00805F2CD064")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IObjectSafety
{
    [PreserveSig()]
    int GetInterfaceSafetyOptions(ref Guid riid, out int pdwSupportedOptions, out int pdwEnabledOptions);

    [PreserveSig()]
    int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions);
}

And the class itself:

[ProgId("Testing.Test")]
[ClassInterface(ClassInterfaceType.AutoDispatch)]
[ComVisible(true)]
public sealed class Test : IObjectSafety
{
    #region Saftey Interface
    private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001;
    private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002;
    private const int S_OK = 0;

    [ComVisible(true)]
    public int GetInterfaceSafetyOptions(ref Guid riid, out int pdwSupportedOptions, out int pdwEnabledOptions)
    {
        pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
        pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
        return S_OK;
    }

    [ComVisible(true)]
    public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions)
    {
        return S_OK;
    }
    #endregion

    [ComVisible(true)]
    public string TestString
    {
        get
        {
            return 'A Test';
        }
    }
}