Hi, Just for your information, I back-ported some MinGW-related fixes in DCMTK 3.6.0 to the DCMTK fork in CTK. CTK can now be build with MinGW and DCMTK enabled. Since back-porting is not really a nice job, I also want to emphasize that using the official DCMTK version in CTK is quite important. Thanks, Sascha