I CRM 4.0 usual is to work with GAC (Global assembly cache)
Replace file, delete file, copy file.
If failed to delete or copy file from GAC
Make the next instructions:
How to view windows/assembly folder
1. Open Regedit, browse to HKLM\Software\Microsoft\Fusion.
2. Add a REG_DWORD value named 'DisableCacheViewer'; set it to 1
3. open an Explorer window and type in C:\WINDOWS\assembly\GAC_MSIL\
Open GAC ( c:\windows\assembly\msil and copy the relevant file and remove
After finish change 'DisableCacheViewer' to 0
Thanks
Rami Heleg.
