Edit: This problem was fixed in version v2.11.0502 released on May 2, 2011, so I removed the download link for my custom version.
ILMerge.exe(v2.10.0526), v4.0.30319, v4.0.20926. ILMerge.exe :
( , )
,
/targetplatform:v4,c:\Windows\Microsoft.NET\Framework\v4.0.30319
v4.0.30319. Reflector, . .
, ILMerge.exe.config, , ILMerge.exe .Net 4, , ILMerge.exe . Net 4. /targetplatform.