We have recently installed Office 2013 on our development PCs. After installing Office 2013, we are no longer able to load our VSTO project (Word Add-in) in Visual Studio. Any ideas why this would be and what we can do to load the project?
In the solution explorer it says Load failed and the details are that a project with this name has already been loaded in the solution.
Note: Another developer with Office 2010 is still able to load the project just fine so the variable here is definitely Office 2013.
UPDATE: I found the following on MSDN wrt to the same error experienced from 2003 - 2010:
To resolve this issue, edit the .vbproj or .csproj file. For a Word project, replace HostPackage="{763FDC83-64E5-4651-AC9B-28C4FEB985A1}" with HostPackage="{6CE98B71-D55A-4305-87A8-0D6E368D9600}". For an Excel project, replace HostPackage="{B284B16A-C42C-4438-BDCD-B72F4AC43CFB}" with HostPackage="{825100CF-0BA7-47EA-A084-DCF3308DAF74}". For an Outlook project, replace HostPackage="{D2B20FF5-A6E5-47E1-90E8-463C6860CB05}" with HostPackage="{20A848B8-E01F-4801-962E-25DB0FF57389}".
Alternatively, ensure that migrated projects are only opened on development computers with Microsoft Office 2010 already installed.
So it looks as though I just need to find the right GUID to replace the HostPackage ID with. Any idea where I'd find the correct ID?
