unresolved symbols

A colleague modified his ATL project and now he's getting

2>FolderFileCtrl.obj : error LNK2019: unresolved external symbol 
"public: __thiscall WTL::CString::~CString(void)" 
(??1CString@WTL@@QAE@XZ) referenced in function 
__unwindfunclet$??0CFileDialogFilter@@QAE@PB_W@Z$0

2>FolderFileCtrl.obj : error LNK2019: unresolved external symbol 
"protected: static void __stdcall WTL::CString::Release(struct 
WTL::CStringData *)" (?Release@CString@WTL@@KGXPAUCStringData@2@@Z) 
referenced in function "public: wchar_t * __thiscall 
WTL::CString::GetBuffer(int)" (?GetBuffer@CString@WTL@@QAEPA_WH@Z)

2>FolderFileCtrl.obj : error LNK2019: unresolved external symbol 
"protected: static class WTL::CString const & __stdcall 
WTL::CString::_GetEmptyString(void)" 
(?_GetEmptyString@CString@WTL@@KGABV12@XZ) referenced in function 
"protected: void __thiscall WTL::CString::Init(void)" 
(?Init@CString@WTL@@IAEXXZ)

2>FolderFileCtrl.obj : error LNK2019: unresolved external symbol 
"protected: void __thiscall WTL::CString::Release(void)" 
(?Release@CString@WTL@@IAEXXZ) referenced in function "protected: int 
__thiscall WTL::CString::AllocBeforeWrite(int)" 
(?AllocBeforeWrite@CString@WTL@@IAEHH@Z)

Any ideas? We've moved libary order, changes include order with no success.

thanks
Mike


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