Test Design Studio already comes with a built-in file difference viewer, but, admittedly, there are better tools available from vendors that focus specifically on that feature.  In the next release of Test Design Studio 2, you can configure the use of 3rd-party software for file comparisons.

Select “Tools –> Options” from the main menu and navigate to “Environment \ Documents”.

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In the screenshot above, you can see where we have configured Test Design Studio to use Beyond Compare for file comparisons.

Important Note: QuickTest Tests are not files, but rather folders that contain many different files.  When performing a comparison for QuickTest tests, the path of the QuickTest folder will be passed to the external command.  Most utilities will then perform a folder-based comparison where you can drill down on individual files.