Hello, SNNy, you wrote: O>> One question - what for to use Qt there where the button and message box is necessary only? SNN> And what it is necessary to use.NET? Well it is possible to make, for example, DialogBoxParam + MessageBox. There will be exe in the size a kilobyte in 40. Hello, vf, you wrote: vf> answer your question I can not, how you would think what for it it could be necessary for someone? vf> at me at that simply test project to look at the size . And here what for it is necessary to write such program on qt - I do not know. What for it generally could be necessary? For my part it was, probably, any unsuccessful rhetoric. Simply Qt traditionally use in the big serious applications where fifty superfluous megabytes are not evident. And here to use it for small type "the button and message box" is a perversion, I consider... And to make something in respect of noticeable reduction of the sizes exe hardly it turns out.