Created Unassigned: Why is vld_x86.pdb requested? [10621]

I am deveopingt an ActiveX control in VS2013 c++ to be used with MS Access. After starting the Debugging of the in Access embedded ocx, VS asks for the Position of the vld_x86.pdb file, which shall contain the Debugging Information of the corresponding dll. Since this file is not distributed, further Debugging is not possible with VLD.
Any sugestions?
Regards Uwe