[Resolved] Can't make a minimal Qt runtime set for my project

I have a project compiled with Qt 5.3.2 and MinGW 4.8.2. It use icudt52.dll, icuin52.dll, icuuc52.dll, libgcc_s_dw2-1.dll, libstdc++-6.dll, libwinpthread-1.dll QtCore.dll, QtGui.dll, Qt5Widgets.dll and the platform/qwindows.dll files. The project does execute correctly from the PC with Qt/QTCreator installed, but even when all these files are present in an other PC, the project just shows an empty window. No error message. I suppose there are some other files required, but have no clue to know which ones.