I am using Visual Studio Professional 2013 and for one of my ASP.NET MVC 5 solutions a couple of weeks ago, it was perfectly fine to add new views with a period in their name. For example adding "About.es" which would create the Spanish language localized version of About.cshtml as About.es.cshtml.
Now I have another ASP.NET MVC 5 solutions made with the same IDE but it does not allow me to create any (partial) view with a period in it, I get the following error message:
"Add View
The name is not allowed to contain any of these characters: . - @ < .........
"
so why is that all of a sudden without making any change to the IDE? Now I can only create them without period. On the Solution Explorer I can rename them to the name with period (workaround) but I used to be able to name the view with period in it.