Custom build, additional dependencies

Is there a way to tell the VS2010 compiler/make to use an entire project subfolder as an additional dependency in a custom build step ?

I'll explain.

Suppose I have a C++ Application project with with following Project Solution layout

Code:

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Solution 'MyApp' (1 project)
  MyApp
      External Dependencies
      Header Files
        MyApp.h
        resource.h
        StdAfx.h
      Source Files
        MyApp.cpp
        MyDataParameters.bar
        StdAfx.cpp
      Resource Files
        MyApp.ico
        MyApp.rc2
      MyDataFiles Files
        MyData1.foo
        MyData2.foo
        MyData3.foo

---

I have a Custom Build Step defined on MyDataParameters.bar.

Is there a way that I can automagically tell VS2010 that it should add all the files in the 'MyDataFiles Files' folder as additional dependencies for that Custom Build Step?
This is a simplified example of course. I know I can do this manually by specifying
MyData1.foo;MyData2.foo;MyData3.foo
But I'm needing this for a couple hundred projects and the number of additional dependencies per project amounts to several dozen up to several hundred in some projects. Setting the dependencies manually is extremely annoying and error prone.
The list of files to be processed gets changed regularly which is why doing it manually is such an annoyance.

Quote:

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Originally Posted by OReubens

[...]
But I'm needing this for a couple hundred projects and the number of additional dependencies per project amounts to several dozen up to several hundred in some projects. Setting the dependencies manually is extremely annoying and error prone.
[...]

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This case, it's time to deal with Project Property Sheets

yes, already in the process of changing the VS2008 projects to use a set of those.

But that doesn't answer my original question... :(