Ok: I tried to give it something to find.

I pasted an existing .avi file into the folder.

Then I ran Poser and told it to replace the existing file with the new one.

I got the same message and the file I had placed in the folder had disappeared.

So it removed it and didn't replace it.

Next step is to completely remove Poser and all registry entries and see what happens when I reinstall it.

If you shoot a mime, do you need a silencer?