Just recently this has started happening to me too.
I'm not saying it is because of XnView, maybe it is because of my quicktime installation
but even in that case I believe XnView should handle this more gracefully.
Here's a link to a sample movie.
I put it by itself in a directory and after entering the directory XnView crashed in a few seconds.
http://dl.dropbox.com/u/49350518/P1030670.MOV
In fact, Firefox also complains, so I might have a Quicktime problem but Firefox doesn't crash.
Here's the output of the error. Hope this helps:
Problem signature:
Problem Event Name: APPCRASH
Application Name: xnview.exe
Application Version: 1.98.0.0
Application Timestamp: 4f5a0ae3
Fault Module Name: QuickTime.qts_unloaded
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4ea5d656
Exception Code: c0000005
Exception Offset: 6834aa99
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: 6bcd
Additional Information 2: 6bcde7812013385e3f8c6e4751551664
Additional Information 3: 386e
Additional Information 4: 386e4f2c269bb7bb1359165473d779f7
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