What file are the form designer form properties stored and how are they stored??

In Microsoft Development Studio 2005  C# (CSHARP)  much of the property setting in a forms is handled invisibly and so I do not see the details I would like to better understand where this information is stored.

I have been using this product for some time but I have yet to figure out how where (what file(s)) the properties are set in my projects. Can anyone tell me which file stores say.  Panel background Color or  Button Background color? or panel container background color or font style and size for  a button or tree view

I am currently unable to find these settings. If they are stored in some xml or  a binary file it is not clear to me who and which one.

My first thought would be .RESX
Here are the possible file types:
*.CSPROJ.USER  
*.CSPROJ
*.CS
*.RESX
*.RESOURCES
*.DLL
*.EXE
*.PDB

I think it may be in the .Resources file but that file is in some Microsoft file format that is not easily read
This file appears to be created  but for what purpose and when is it created.
I just tried to change a property and the files changed were?
Also what is the file: ResolveAssemblyReference.cache?  What is it for?