Why does Visual Studio want to check-out a File when opened?

Question

Why does Visual Studio want to check-out a File when opened?

I just double click the file to open it and Visual Studio wants to check it out. I did not make any changes to it. I just opened it.

i.e. In Solution Explorer I double click ctlEmployeeEdit.vb and the first thing Visual Studio wants to do is check-out that file. I got VS set up to prompt me on check-out so I normally say no to the check-out and then the control will display.

We are using Visual Studion 2005 and Visual Source Safe 2005.

We have a solution of over a hundred files and it is only happening on a hand full of them but that hand full seems to be getting larger, almost a mouth full now. (Humm I wonder if a hand full is larger than a mouth full? But that question is for another posting.)

Also how can this be fixed?

Should I delete my local copy of the solution and do another "Get Latest" from Visual Source Safe when this happens?

I have the feeling some of you are going to say the way to fix this is to upgrade to a REAL Source Control producted. :)

Edited:

Some of the Third Party controls are:

1. DevExpress User Controls v8.3
2. IdeaBlade DevForce control

Answer 1

I believe this can happen with special types of files - specifically setup project files, but you're not being overly specific as to what kind of file it is?

At least that is how it works in TFS 2008.

Answer 2

Do you have any WinForms designers open? Sometimes VS.Net wants to change these files, this is usually the case when the designer can't load a custom control due to reference problems.

Answer 3

This is not the default VS behavior. It's almost certainly a 3rd party plugin that is doing something on file open that is ending up in a check out request. What plugin's do you have installed?

There's also some designers that end up checking out files on accident when they are open. Do you have any designers open?