Programmatically open a file in Visual Studio (2010)

I believe you want one of:

1. IVsUIShellOpenDocument.OpenStandardEditor
2. DTE.OpenFile
3. DTE.ItemOperations.OpenFile

In the end, I think they all boil down to the same behavior.

I like to use the DTE method ExecuteCommand("commandName") as you can test the command in the VS Command Window

In this case ExecuteCommand("File.OpenFile")

You can add parameters to the command in a second optional string parameter if you wish.