[Qt-interest] Native Dialog crashes using QFileDialog

[Jan Wurster]

 Dear list,

 To begin with - I know this is not (at least not directly) - Qt problem
;)

 We've recently noticed that our application seems to crash in open file
dialogs on certain machines when clicking on or even just hovering over
media files.

 The issue seems well known throughout the net, there's even a
workaround available that 'fixes' the problem. One of many poor souls
that ran into this issue posted here:

http://club.cdfreaks.com/f32/windows-explorer-crashes-when-starting-avi-
just-pointing-cursor-over-avi-f-126014/

 Apparently media previewing / shmedia.dll is the culprit - or certain
codecs that have problem handling unicode-formatted (?) requests from
the windows API for previewing videos. Windows explorer itself doesn't
crash (any more!) - it seems that the issue got fixed in a patch.

 The workaround of course is to unregister shmedia.dll as follows:

regsvr32 /u shmedia.dll

 This always helped, any media files that previously led to the crash
now wouldn't any more.

 As we cannot easily enforce this on customer systems the questions
remain: 

 - Is it at all possible - we're using the static methods of QFileDialog
- to catch this 
   problem? My personal experience with the windows API is limited,
unfortunately.

 - Is there a way to disable media previewing via QFileDialog options?
I've browsed the 
   documentation but didn't actually see anything in ViewMode or similar
that related to 
   previews.

 Best regards,
-.jan.-