embed the crviewer and craxdrt components in your application (comes with a free CR developer version) so that you can view reports without changing them. Basic manipulations (scaling, searching, exporting to PDF, showing / hiding parts or groups) can still be performed.
If you must run this viewer from the command line, I would advise you to insert it into the office document / file and manage it through VBA. For example, you can run an Access version (free for distribution) that will contain one common form for Crystal Reports to display.
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