as of visual studio 2015 update 2 this file stores the intellisense database.
this file is typically huge and shouldn't be included in a repository.

In addition to *.VC.opendb, *.VC.db file should be regenerated by Visual Studio automatically. So, it makes sense to ignore *.VC.db file too as it's been ignored in https://github.com/github/gitignore/blob/master/VisualStudio.gitignore

Title.

Visual Studio 2015 moved all the user specific configuration to a .vs folder, which shouldn't be tracked.

Add *.VC.opendb to the .gitignore for the UnrealEngine for Visual Studio 2015 Update 1 users. This reflects the changes in the VisualStudio.gitignore made in https://github.com/github/gitignore/pull/1778 and https://github.com/github/gitignore/pull/1783 but is more specifically targeted at solving the issue http://stackoverflow.com/questions/34319008/git-issue-with-visual-studio-2015-update-1 .

samsheff accidentally typed a few of the lines twice ^.^