Open multiple files simultaneously in VS2013 directly from Visual Studio's Solution Explorer pane.
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Similar "Open In" VS extensions can be found here.
Features
Open single files
Open mulitple files simultaneously
Open folder
Open project file (e.g. *.csproj)
Open solution file (e.g. *.sln)
Use Cases
The Visual Studio IDE has an outstanding and feature-rich editor for a wide range of file types, even in the free "Community" editions, which can be overridden to open a third-party application.
That said, there may be times when you wish to edit a file in an alternative editor/application without overriding the default Visual Studio editor, for example:-
You only occasionally wish to use a specific alternative editor.
You have overriden the default Visual Studio editor to a particular application, but need easy IDE access to a second particular editor.
Certain files (e.g. gigantic size files, or files with complex content) may be better suited in an alternative editor.
Pair programming scenarios where each developer has different preferred editor.
You are more familiar with a certain editor's features, or simply have a favourite editor.