>I am creating custom Crystal Reports in Version 11 for a client.
>
>They have an existing application that uses Crystal Reports Version 7.1.
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>I don't think I can tie the new Version 11 reports into the existing system because of runtime file incompatibility. Is that right?

That's correct. They'll need the Crystal 11 runtimes to make this work.

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>Also, if I modify one of their existing reports using my Version 11 software then it won't run in their existing system due to runtime file incompatibility? Is that right?

Nope, it won't open in 7.1. That has nothing to do with runtime files, but the format of the .rpt file is different.

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>Finally, what if I installed Crystal Reports Version 6 and modified their reports that are run using Version runtime files, then would I also have an incompatibility problem?

I would uninstall 11, then install 6 and reinstall 11.

>
>I imagine the software is more backward compatible than forward compatible. Thanks for your help.