When you install 64 bit version of BizTalk sever, the application installation folder will have 2 BizTalk configuration files.
1. BtsNTSvc.exe.config, and
2. BtsNTSvc64.exe.config.
Nowadays most of the production BizTalk servers will be running on 64 bit versions of software (Operating system, BizTalk, SQL etc). In majority of the situation you'll be only using the 64 bit in-process host instances on the server. In that case all your custom configuration should be placed in...
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