Reason: Could not load file or assembly ‘file:///C:\Program Files (x86)\Microsoft BizTalk Server 2009\Pipeline Components\Microsoft.Solutions.BTAHL7.HL72fDasm.dll’ or one of its dependencies. An attempt was made to load a program with an incorrect format.

Make sure that your host is running under 32bit mode, if it is running in 64 bit mode, you will get this error.