C# Properties

[complete]

I have been able to create a C# program from scratch.
When I do so, I automatically get a list of References like this:
[IMG]http://i67.photobucket.com/albums/h292/Athono/csharp.png[/IMG]

When I open a project developed by a co-worker, I get a list
of References that looks like this:
[IMG]http://i67.photobucket.com/albums/h292/Athono/01-1-1.png[/IMG]

This is very different and I suspect is the cause of some problems.
I am unable to double click on these items without getting an
error message.

Also, if I right click on these items and choose "Properties", I
am unable to edit a lot of key items such as path name.

[scru]

Perhap try changing the target framework in the project properties to the max allowable?

[Infarction]

Different framework versions is a possible cause. What did you and your co-worker each use to create the projects?

As to their properties, most of them should not be modifiable.