On Windows 7, automatic updates of Warcraft 3 don’t work like normal, and the cinematics don’t show up – rather, you only hear the audio. This is how to fix it.
This took a small bit of googling to find; I’ll add my own version of how to do this below.
Assuming that Warcraft 3 was installed normally (i.e. to the Program Files folder):
Run Warcraft 3 as an administrator and connect to Battle.net; this will download the latest updates.
Result: game gets updated, and cinematics display, however they are ugly and basically washed out.
Right click on the shortcut you use for launching Warcraft 3, and then select Properties. In the next window, select the Compatibility tab at the top, then check “Disable desktop composition”.
Result: cinematics now display normally.
Please note: manually registering codecs should not be necessary, nor should you need to adjust gamma settings specifically for Warcraft 3.
Tested on: Windows 7 64-bit with Intel HD Graphics 4000.
NOTE: I don’t know whether downloading maps, etc., works as expected or if this also gives errors if not run as administrator. Either always run Warcraft 3 as the administrator, or relocate the installation folder to an unprotected location. (Other web pages out there tell how to do this; I haven’t done this myself.)
Hope this helps someone out there…