Target extension property is not modified on VS2010

The attached example dll demonstrates the use case.

Test steps:

• On command prompt run qmake -tp vc
--> note the mydll.pro content i.e. it specifies a TARGET_EXT and DLLDESTRIR:

TARGET = MyDLL
TEMPLATE = lib
TARGET_EXT = .tsdll
CONFIG += dll
DLLDESTDIR = ../lib

DEFINES += MYDLL_LIBRARY
SOURCES += mydll.cpp
HEADERS += mydll.h\
        MyDLL_global.h

• Open the generated .vcxproj file with Visual Studio 2010.
• Select 'build' for the project

Error: Coping the generated MyDLL.tsdll to ..\lib fails even if MyDLL.tsdll is generated to \debug folder:

1>  Description: Copy MyDLL.tsdll to ..\lib
1>  The system cannot find the file specified.
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(113,5): error MSB3073: The command "copy  "D:\example\debug\MyDLL.dll" "..\lib"
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(113,5): error MSB3073: :VCEnd" exited with code 1.

When you modify the target extension property (Properties - Configuration properties - General - Target extension; please see the attachment) on Visual studio so that it includes '.tsdll' instead of '.dll' the MyDLL.tsdll is properly copied into the defined targed directory (..\lib).