Webplayer ocx src path problem

I added webplayer ocx in to visual studio c# form(winform) When I compiled, application doesn't find the .unity3d file. Acctualy unity3d file near of the application exe. I have tried following src path of the OCX but no success. ./my.unity3d ../my.unity3d .\my.unity3d .\my.unity3d

When I put my.unity3d file in to C:/ and set the src to "c:/my.unity3d" its okay.

But I want to put the my.unity3d file to near of the application exe.

How can I solve this problem. Thank you.