Donwload files and extract Reflector.BizTalkDisassembler.dll
into the same directory as
. Go to View | Add-Ins in Reflector, and Add
Right click on the BizTalk assembly and select "BizTalk Server 2006 Artifacts".
You should see a list of all artifacts, with their type, name and namespace they were compiled into. Click the "Disassemble..." button to disassemble all selected artifacts into files. You can select / de-select artifacts by using the selection check
box on the right.
In the disassemble dialog, specify the path to the directory where files should be created and press "Disassemble". The disassemble dialog is multi-threaded for a more responsive user interface.
From: BizTalk Addin for Reflector