This is a specific error message from libtiff only under Windows. There is no reason to see this warning. At least DK do not report as well this message, but libtiff force to show this message box.It must have a mechanism somewhere in library that we need to disable while to build Windows installer.
Please report this problem in DK bugzilla (section Bundle-Windows), i will take a look when time permit.
Thanks in advance
Gilles Caulier