Problems with common dialog functions in a binary dll - c++

Question

I did a simple test of using common dialog in a console application and everything worked properly. Then I tried to use the same code putting it in a binary dll. I called my function from Vb 6 and strange things have begun to happen.
I have already tried to call other functions from vb 6 contained in this dll without problems.
With the common dialog, on the first call, the dialog appears correctly. The next calls vb says it cannot find the dll (error 53) and I have to close and reopen the IDE of vb 6. It only happens using the common dialog functions. For every other type of code this problem does not occur.
Here is the code:
C++:
bool _stdcall FsDialog(HWND hwnd){
OPENFILENAME openFile;
wchar_t szFileName[MAX_PATH];
wchar_t szFileTitle[MAX_PATH];
int index = 0;
ZeroMemory( &openFile, sizeof(OPENFILENAME) );
openFile.lStructSize = sizeof(OPENFILENAME);
szFileTitle[0] = '\0';
szFileName[0] = '\0';
openFile.hwndOwner = hwnd;
openFile.lpstrFilter = L"Logs (*.log)\0*.log\0";
openFile.lpstrFile = szFileName;
openFile.nMaxFile = MAX_PATH;
openFile.lpstrFileTitle = szFileTitle;
openFile.nMaxFileTitle = sizeof(szFileTitle)/sizeof(*szFileTitle);
openFile.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;
openFile.lpstrDefExt = L"log";
if (GetOpenFileName(&openFile)){
return(1);
}
}
VB6:
Private Declare Function FsDialog Lib "mydll.dll" (ByVal hWnd As Long) As Integer
Private Sub Form_Load()
Debug.Print FsDialog(Me.hWnd)
End Sub