Connection string to OpenOffice Database

Okay, Let me pose this question as a way of explaining what I am trying to do.
We write customized software for our clients and we currently do it in VB6 and use MS Access as our database. Each package we write is similar to previous packages but each is always somewhat different. Part of the software uses MS Excel, and sometimes MS Word to generate test reports. This means that for every package we build we need to purchase a copy of MS Office Professional (which includes MS Access)
What I was trying to do with OpenOffice was eliminate the expense of MS Office Pro.

So, if MS SQL Server 2008 Express is free then perhaps I could use that instead of the OpenOffice database application and still use OpenOffice for the report generation.
However, I don't know enough about SQL Server Express to answer the following part of this problem:

As the developer of the software we need to keep a separate copy of the database for each system package we sell. Currently we keep a copy of the MDB file from Access with the rest of the VB files in a separate folder for each client.
If I were to use SQL Server Express, would I have individual database files that I could move off of my development machine and store on a DVD for example for later use?

Thanks,
Charlie

Thanks for the links.
I would like an answer to my other questions regarding Open Office and MS SQL Express however I guess I will continue to research.