Recompile app as 64 bit

Dear sirs

I developed some C# 32 bit application based on your MapWinGIS.ocx component.
It works well.
Now I have some reasons to recompile it to 64 bit application.
I tried to do it on another computer where installed 64-bit MapWinGis.
Failed to do it. One of the reasons is absence of AxInterop.MapWinGIS.dll that I should have reference to. Could you give me a clue what should I do in order to recompile my application as 64 bit one?

Best regards
Vadym