C# using DtSearch API

I'm deploying a C# application that uses DtSearch on a number of different machines.  I'm finding that when the app is built with dtsearchNetApi.dll, it runs successfully on Windows XP machines but not Windows 2003 machines.  When the app is built with dtsearchNetApi2.dll, it runs on Windows 2003 machines but not Windows XP machines.  The failure occurs when trying to execute a method on an instance of a class that uses dtSearch.Engine ("using dtSearch.Engine;").  So something like this:

IndexReader ir = new IndexReader(lstItems);  // OK
ir.ReadIndexes();  // Fails

System.IO.FileNotFoundException: The specified module could not be found. (Exception from HRESULT: 0x8007007E)

The app is deployed with ClickOnce, and either dtsearchNetApi.dll or dtsearchNetApi2.dll is included in the Application Files on the Publish tab. The main dtSearch library - dten600.dll - is registered on all machines.
jkavxAsked:
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Stacy SpearPresident/Principal ConsultantCommented:
You probably need to include the file (copy the dll) into your solution and set it to publish. I'm thinking that even unregistered, if the dll is in the same directory as the executable, it will see it.
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jkavxAuthor Commented:
I've tried referencing dten600.dll.  This builds interop.dtengine.dll into the solution.  But it doesn't help.  
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jkavxAuthor Commented:
If I put msvcr71.dll in the directory of the executable, I can use dtsearchNetApi.dll on a Windows 2003 machine.  This link "http://support.dtsearch.com/dts0197.htm" includes this:

"You may also be missing one or more of the Microsoft runtime library DLLs.  For dtSearchNetApi.dll, msvcr71.dll is required.  For dtSearchNetApi2.dll the MFC 8.0 and CRT 8.0 merge modules are required."

But using ClickOnce for deployment, I'm not sure how to include this dll in the deployment package.  I've put it in the compile directory, and included it in the project (Show all files in the solution explorer and right click on include).  Then I set the properties of the included dll to "Build Action:  None and CopyToOutputDirectory:  CopyAlways."  But on the Publish tab, which I click on Application Files, the dll does not appear.  Am I missing a step here, or not setting the properties correctly?
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jkavxAuthor Commented:
I find that I can include the dll by:  Project\Add Existing Item, select the dll that was added, and change CopytoOutputDirectory to CopyAlways (Build Action will be set to Content).
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jkavxAuthor Commented:
The dten600.dll was not the issue.  Msvcr71.dll needed to be added for dtsearchNetApi.dll to work on the Windows 2003 server.
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