Send Port Filter

First you need to create a Biztalk project, with a property schema defining you new property. This needs to be built and deployed.

Then you create a simple pipeline component. I would suggest using Martijn Hoogendoorn’s Pipeline Component Wizard that will create the shell project for your component.

http://www.gotdotnet.com/Workspaces/Workspace.aspx?id=1d4f7d6b-7d27-4f05-a8ee-48cfcd5abf4a

You need a very simple pipeline component.
In the Execute method you can read the FILE.ReceivedFileName property from the context,
[code:1:b98450480e]inputMessage.Context.Read(\"ReceivedFileName\", \"http://schemas.microsoft.com/BizTalk/2003/file-properties\");[/code:1:b98450480e]
possibly parse the string removing the path info and promote the result into your property
[code:1:b98450480e]inputMessage.Context.Promote(<Your PropertyName>, <your property schema namespace>, <new value>);[/code:1:b98450480e]

There is no need to to read the data stream, the most complicated part of a pipeline component. The FILE properties are set by the adapter so you can position your component in any stage except the Disassemble stage and you do not have to worry about the completion of the stream read.

Once built you copy the resulting DLL to the [b:b98450480e]C:\\Program Files\\Microsoft Biztalk Server 2004\\Pipeline Components[/b:b98450480e] directory
To debug, you can attach to the BTSNTSrv.exe process setting appropriate breakpoints in VS2003