LoadLibrary error from dll

I have created a dll in Labwindows CVI. In this dll I dynamically call another dll using LoadLibrary function. This dll works fine when I call in labwindows cvi but using labview I can't load dll using LoadLibrary function. Any idea why?
for example;
I have created mydll.dll in cvi.
In mydll.dll I have code like this
    dll_handle = LoadLibrary ("LIB2.dll");
    if(dll_handle == NULL)
     MessagePopup ("ERROR", "LIB2.DLL Load Error");
     return -49;
using labwindows I can call mydll.dll and it successfully loads LIB2.dll.
When I call mydll.dll in labview  dll_handle is null. another words it couldn't load LIB2.dll using SDK LoadLibrary function.
Message Edited by test_man on 08-06-2008 01:41 PM
Thanks.
CVI 2010
LabVIEW 2011 SP1
Vision Builder AI 2011 SP1

yes, all dlls, cvi project and labview project are in same dir.
Message Edited by test_man on 08-06-2008 02:18 PM
Message Edited by test_man on 08-06-2008 02:19 PM
Thanks.
CVI 2010
LabVIEW 2011 SP1
Vision Builder AI 2011 SP1

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