CollapseOnOpen

It's just aCollapse On Open tool (made by Marc-André Croteau) ported to Visual Studio 2013 as creator has not done
VS 2013 version as of now.

Quote from original description:

When you open documents, do you want regions/methods/comments to be collapsed ? I fixed that for .cs documents ! When you are navigating through your files, it's easier to navigate through your regions/methods
This extension automatically runs "Edit > Outlining > Collapse To Definition" Visual Studio command when opening ".cs" documents.

hitas