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You wrote:....It's an AVI file ......

Sorry but that doesn't help much.
There are a small handful of file extensions that describe that a computer file is a video. These include
avi, mpeg, mov, rm, wmv, qt, swf
Plus a few others.
Think of these as groups of of a certain form of video, within those groups are lots of individuals. Liken this to animals, there are dogs, cats, snakes, birds, rodents and so on.
Within these groups are several types. For instance a dog can be a Poodle, Jack Russell, Alsatian, King Charles, Greyhound etc.

The term avi can mean any one of perhaps a hundred different types such as DV, MPEG4, uncompressed, MJPEG, DivX, Xvid, RLE, YUV, Cinepak and lots more.

You need to be more specific.

Let's start from square one. Where will these AVIs be coming from? Right click on one and post it's properties here.

I have run a reinstall/repair on the installation and now I'm able to open AVI files as before. Somehow the appropriate file "filter" was not installed the first time.

Thanks for your time/help, boys/girls.