Thanks for the replies. Dependency Walker is indeed a great tool! Thanks Doron Moraz for that. Using Dependency Walker I find a horrible thing: the Qt application also needs QtCore4.dll and QtGui4.dll together having size 10.7 MB where my application is 291 KB. I don't like the idea to bear megabytes of dlls for application of much less size. I want to lean how can I embed somehow those dlls into the application executable file. Can anyone help me?

Thanks.