How to debug Loadlibrary

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VC6

C++

Hello,I am a new commer.
I face to surprise problem now:
Using VC6.0 I edit this code to load dll in my computer,It is just OK to return HANDLE,
but when I copy the code to another Win7 PC to compile and run,hdllHandle always return NULL。
I have debug and Check that Relative path we point is OK.
What is the problem? Thanks you in advance.

CString csDllPath=m_strWorkPath+"\\CmdDLL.dll"; //Relative path is OK
HINSTANCE hdllHandle;
hdllHandle=LoadLibrary(csDllPath);