Access to the database file is not allowed.

I'm connecting to an Sql Compact database (3.1) from a C# assembly exposed via COM and called from inside a winsock LSP. The database is only used once on instantiation of the class, which happens in the first call to WSPStartup.

The issue I'm having is that under Vista and when running inside IE7 I get the error in the title. However there is no problems with IE7 under windows XP, or with Firefox and MSN Messenger under XP or Vista!

When selecting to run IE as administrator, the problem dissapears, however when using the LogonUser API to impersonate an administrator it doesnt.

This would seem like a permissions issue, strange though that Firefox under vista has no problems.. Also, the following code throws no SecurityException under either browser, indicating the code is running with full trust.

new PermissionSet(PermissionState.Unrestricted).Demand();

Any input would be a huge help, I've been banging my head against this all day..
I can now confirm this same behaviour on VS08 Beta 2 and SqlCe 3.5

Any ideas? Anybody point me in the direction of a better place to ask as this seems more like something specific to IE7 and Vista than SqlCe as such?

Many thanks
|||To answer my own question, by default in Vista, IE runs in protected mode and is a "low integrity" process, it has even less priveleges than the logged on user, including a logged on but not elevated administrator.

Since my .sdf file was a medium integrity resource... Access Denied!

For reference, further details here.