Thank you for your reply,
This control is added by choosing Items from "COM Components" in Visual Studio, and it is added to Toolbox control as "Adobe PDF Reader" which references to "AcroPDF.dll"
by the way, I just want to get your attention to the following points:
1- The purpose of this to allow user preview PDF file before selecting them "like windows explorer"
2- I noticed the file "AcroPDF.dll" goes under x86 programs which means it is 32-bit, while my OS is 64-bit and CPU is 64-bit as well
Thanking you