What is Fusion Log?

Also known as the Fusion Log or Assembly Binding Log Viewer.
This tool is installed as part of Visual Studio and is not available otherwise.
This displays details for failed assemby binds or missing dependencies.
There is a small performance hit when this is switched on.
There are two ways to enable the log.
Either from the command line or using the user interface
SS
msdn.microsoft.com/en-us/library/e74al8c4(v=vs.110).aspx

Location

Windows 7 - C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin\FUSLOGVW.exe
Windows XP - C:\Program Files\Microsoft SDKs\Windows\v6.0A\Bin\FUSLOGVW.exe

Registry Entries

HK Local Machine\ Software\Microsoft\Fusion\
Create the following values in the Fusion folder:
EnableLog (DWORD) = 1
ForceLog (DWORD) = 1
LogFailures (DWORD) = 1
LogResourceBinds (DWORD) = 1
LogPath (String) = C:\Temp\FusionLog
This folder path must exist already

Scripts

To Enable:

Set-ItemProperty -Path HKLM:\Software\Microsoft\Fusion -Name ForceLog         -Value 1               -Type DWord
Set-ItemProperty -Path HKLM:\Software\Microsoft\Fusion -Name LogFailures      -Value 1               -Type DWord
Set-ItemProperty -Path HKLM:\Software\Microsoft\Fusion -Name LogResourceBinds -Value 1               -Type DWord
Set-ItemProperty -Path HKLM:\Software\Microsoft\Fusion -Name LogPath          -Value 'C:\FusionLog\' -Type String

To Disable

Remove-ItemProperty -Path HKLM:\Software\Microsoft\Fusion -Name ForceLog
Remove-ItemProperty -Path HKLM:\Software\Microsoft\Fusion -Name LogFailures
Remove-ItemProperty -Path HKLM:\Software\Microsoft\Fusion -Name LogResourceBinds
Remove-ItemProperty -Path HKLM:\Software\Microsoft\Fusion -Name LogPath

How to Use

Add the above registry entries
Close and reopen Excel
Launch the Fuslogvw.exe to see the log entries.

Reference

How to enable assembly bind failure logging (Fusion) in .NET