When I tried to select designer view in VS 2010 I get this error:
There is no editor available for \'c:\\user\\teadrinkinggeek\\documents\\visual
To solve that issue just check your reference and fix those that has "!".
This happened to me also: related/additional notes related to this fix.
Solution Explorer
--> Expand References
--> Right click on the item with "Yellow Triange w/ "!" point"
--> select "Remove"
Open the "Build" Menu at the top
--> select: Rebuild "filename"
Double clicking on the from name in Solution Explorer would then open the from normally for me.