Windows Default Icon

Windows : Places to Look for Icons

Everything
C:\Windows\System32\shell32.dll

Computers
C:\Windows\explorer.exe

Communication
C:\Windows\System32\hticons.dll

Household
C:\Windows\System32\pifmgr.dll

Folders
C:\Windows\System32\syncui.dll

Old programs
C:\Windows\System32\moricons.dll

Link: http://www.uv.tietgen.dk/staff/mlha/PC/Soft/WIN/App/icon/index.html