MS Office file types icon dll location
Solution 1:
I had the same the problem, but for Outlook 2016. After some searching (with IconsExtract, as mentioned in an answer above) I found several locations which store icons used in the program.
I don't know whether they are the same as in 2013 (and have no way of validating that now), but for those who may have a similar problem in the future, a considerable number of the icons are stored in:
C:\Program Files\Microsoft Office\root\Office16\1033\OUTLLIBR.DLL
C:\Program Files\Microsoft Office\root\Office16\OUTLOOK.EXE
C:\Program Files\Microsoft Office\root\Office16\OLKFSTUB.dll
As for the other microsoft office applications:
For excel:
C:\Program Files\Microsoft Office\root\Office16\EXCEL.EXE
C:\Program Files\Microsoft Office\root\Office16\XLICONS.EXE
For access:
C:\Program Files\Microsoft Office\root\Office16\ACCICONS.EXE
C:\Program Files\Microsoft Office\root\Office16\MSACCESS.EXE
For word:
C:\Program Files\Microsoft Office\root\Office16\WWLIB.DLL
C:\Program Files\Microsoft Office\root\Office16\WORDICON.EXE
C:\Program Files\Microsoft Office\root\Office16\WINWORD.EXE
For publisher:
C:\Program Files\Microsoft Office\root\Office16\1033/PUB6INTL.DLL
C:\Program Files\Microsoft Office\root\Office16\MSPUB.EXE
For powerpoint:
C:\Program Files\Microsoft Office\root\Office16\PPTICO.EXE
C:\Program Files\Microsoft Office\root\Office16\POWERPNT.EXE
For onenote:
I cannot find much for onenote, except its application file(s):
C:\Program Files\Microsoft Office\root\Office16\ONENOTE.EXE
C:\Program Files\Microsoft Office\root\Office16\ONENOTEM.EXE
However, having looked at it, most of the other icons can be found in the other dlls and exes already.
If you are looking specifically for something that looks like the file icons, then you either need to look in Shell.dll in the Windows32 folder, or in this folder:
C:\Program Files\Microsoft Office\root\Office16\LogoImages
Solution 2:
For the location of icons see below MSO 2019
C:\Program Files (x86)\Microsoft Office\Root\VFS\Windows\Installer