Incorrect version of MSJET35.DLL found

When you receive such error message while trying to open an Enterprise Architect project file (.eap), don't worry, the solution is simple. Actually, this error can be associated with any program that uses Microsoft Access database files as it's data containers and the solution is always the same.

First you have to update MS JET 3.5 (http://support.microsoft.com/kb/172733).

When that doesn't help, you can also try updating MDAC (http://msdn.microsoft.com/data/ref/mdac/downloads/) or install (or update) MS JET 4.0.

When that still doesn't help, try restarting your Windows (known to help with all kinds of problems).

When that doesn't help either, search your system for any stray MSJET35.DLL files and remove or update them.

Useful read: Deployment of Enterprise Architect (includes instructions on using JET 4).