VB16 bit to VB32 Bit

Hi there!
          I have a project working in vb-4.0 16 bit.The project involves API calls, DLLs & Vbx controls. I want it to be completely compatible for vb-4.0 32 bit.What are all the changes I have to incorporate.

                 Thank you in advance for your help.
cobrarajAsked:
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rantanenCommented:
About everything except actual VB code. API calls to 32-bit equivalents, VBX -> OCX, write new DLLs or start using thunking, probably some variable types in your program.
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cobrarajAuthor Commented:
Could you please explain about thunking and its usage.
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