Hello,
I'm porting an application from qt3 to qt4 and in fact I'm almost done. The application works fine. I have unit tested each and every functionality and works fine for me.

Problem:
I want to send this application's exe to my friend to test. So I have sent these files to my friend:
1) application.exe
2) Qt3Support4.dll
3) QtCore4.dll
4) QtGui4.dll
5) QtNetwork4.dll
6) QtSql4.dll
7) QtXml4.dll

Now he reports me this:
His words:
START
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I'm able to run the application but when I try to load any file in the pop up file dialog, the application crashes. I dont know why?
I followed these steps:
a) Click File->open
b) A dialog appears.
c) Then select a file and click 'Ok'.
d) Application crashes

Also, In step c), if I dont select any file and just click 'Cancel', still the application crashes.
I think the file dialog what appears doesnt work.
Are u sure you did unit testing?
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END

Then I tried to check if I missed something. I ran the same exe with above mentioned dll. I t worked fine for me.

I'm unable to understand why the application crashes on my friends machine.
NOTE: My friend dont have Qt installed.

How can I solve the above problem? Is there any dll that is missing on my friends machine?

Thanks in advance