BRepTools::Write crashes with Standard_OStream

Hi,

I did an upgrading of my projet from MS VS 2003 + OCC 5.2.0 to MS VS 2008 + OCC 6.5.0.
In that I am trying to save my work via filestream with following code:

............................
ofstream f("D:\MyApp.brep");
f f BRepTools::Write(myTopoDShape, f);
.............................

While it was working fine with VS 2003 + OCC 5.2.0, I get with VS 2008 + OCC 6.5.0 the
following failure if I execute the line with BRepTools::Write(...):

Unhandled Exception Error 0X762fb727 in myApp.exe:
Microsoft +-Exception std::bad_alloc at memory location 0x0018e2e0

An similiar solution with:
.............................
Standard_CString myFileName = "MyApp.brep";
BRepTools::Write(myTopoDShape, myFileName);
.............................
works with VS 2008 + OCC 6.5.0 well.

Any idea ?
Thanks in advance.