Това го копнах от някакъв форум:

Това е по наболелия отдавна въпрос с трудното изтриване на .avi файлове:
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The obnoxious bug in XP that causes Explorer to read the entire contents of broken AVI files before allowing any access to them is caused by bad behavior of shmedia.dll.
To correct this misbehavior in Windows XP, remove the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID{87D62D94
-71B3-4b9a-9489-5FE6850DC73E}\InProcServer32
This will prevent Explorer from loading shmedia.dll in response to file property queries on these files.
Който иска да го превежда