In order to stay at 3.1 database file format, you must continue to use SQL
Server 2005 Management Studio Express SP2 to manage the 3.1 file.

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Erik Ejlskov Jensen, Mobile App Dev MCTS
Check out my SQL Compact blog at
http://erikej.blogspot.com
> I just upgraded my installation of SQL Server 2005 Express to SQL Server
> 2008 Express. When I try to open one of my Sql Compact Edition 3.1
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>
> Thore Berntsen