Hi, don't know how to describe this behaviour, but recently I see that VS 2008 is creating files like vs~123.tmp etc, for files I modify. However, these files are visible in the solution. It this some kind of option I can enable or disable. Or set something so these files are not visible in the solution. It's a kind of annoying see you solution growing day by day.
I can't find anything on the inet about this.
In Solution Explorer, you have an Icon 
at the top which checked means it will 'Show All Files'. It sounds like you might have this checked, if so uncheck it to see if that makes a difference with those .tmp files.
finaly I found that this is caused by the virus scanner (I started to use MS Essentials as my scanner). Using MS Essentials is the cause of these file stay in my project. By excluding my project-folder to scan for viruses solves the problem.
thanks for the reply Jan