File Location

When you install Visual Studio, the PIAs are automatically installed into the Visual Studio folder on the C drive.
These PIAs should not be deployed with your solution, they should be Embedded into your assembly
Office 365, Office 2021, Office 2019 and Office 2016 all use the same PIAs.

Office 365, Office 2021, Office 2019 and Office 2016

These PIAs are not included with Office.
These can all be found in the following folder:

C:\Program Files (x86) \ Microsoft Visual Studio \ Shared \ Visual Studio Tools for Office \ PIA \ Office15 \

There is no version "16.0" of these files.

Microsoft Office 15.0 Object Library	Office.dll
Microsoft Excel 15.0 Object Library	Microsoft.Office.Interop.Excel.dll
Microsoft Word 15.0 Object Library	Microsoft.Office.Interop.Word.dll
Microsoft PowerPoint 15.0 Object Library	Microsoft.Office.Interop.PowerPoint.dll
Microsoft Outlook 15.0 Object Library	Microsoft.Office.Interop.Outlook.dll

Office 2013

These PIAs were not included with Office 2013.
These can all be found in the following folder:

C:\Program Files (x86) \ Microsoft Visual Studio \ Shared \ Visual Studio Tools for Office \ PIA \ Office15 \

Microsoft Office 15.0 Object Library	Office.dll
Microsoft Excel 15.0 Object Library	Microsoft.Office.Interop.Excel.dll
Microsoft Word 15.0 Object Library	Microsoft.Office.Interop.Word.dll
Microsoft PowerPoint 15.0 Object Library	Microsoft.Office.Interop.PowerPoint.dll
Microsoft Outlook 15.0 Object Library	Microsoft.Office.Interop.Outlook.dll

Office 2010

These PIAs were included with Office 2010.
These can all be found in the following folders:

C:\Program Files (x86) \ Microsoft Visual Studio \ Shared \ Visual Studio Tools for Office \ PIA \ Office14 \ 
C:\Program Files (x86) \ Microsoft Visual Studio 14.0 \ Visual Studio Tools for Office \ PIA \ Common \ 
C:\Program Files (x86) \ Microsoft Visual Studio 14.0 \ Visual Studio Tools for Office \ PIA \ Office14 \

Microsoft Office 14.0 Object Library	Office.dll
Microsoft Excel 14.0 Object Library	Microsoft.Office.Interop.Excel.dll
Microsoft Word 14.0 Object Library	Microsoft.Office.Interop.Word.dll
Microsoft PowerPoint 14.0 Object Library	Microsoft.Office.Interop.PowerPoint.dll
Microsoft Outlook 14.0 Object Library	Microsoft.Office.Interop.Outlook.dll

2007 Assemblies

These PIAs were not included with Office 2007.

Microsoft Office 12.0 Object Library	Office.dll
Microsoft Excel 12.0 Object Library	Microsoft.Office.Interop.Excel.dll
Microsoft Word 12.0 Object Library	Microsoft.Office.Interop.Word.dll
Microsoft PowerPoint 12.0 Object Library	Microsoft.Office.Interop.PowerPoint.dll
Microsoft Outlook 12.0 Object Library	Microsoft.Office.Interop.Outlook.dll