I am using the Skype4COM.dll. When the solution platform is set to x86 there is no problem.
But, when I change the platform to x64 I get a COMException :
Retrieving the COM class factory for component with CLSID {830690FC-BF2F-47A6-AC2D-330BCB402664} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).
What is the problem here? Is this caused by the x86 development of Skype? Is there any way to use this dll to a 64 bit solution platform?
You need x64 libraries for 64-bit based applications that are consuming them. Skype does not offer an 64 bit compatible library. It is not possible, to host x86 libraries within x64 processes.
For more information refer to this site: http://community.skype.com/t5/Desktop-API-former-Public-API/64bit-Version-of-Skype4Com-dll/td-p/68234
Also AnyCPU won't work. About x64/x86-problems I suggest reading this article: http://blogs.msdn.com/b/rmbyers/archive/2009/06/09/anycpu-exes-are-usually-more-trouble-then-they-re-worth.aspx