When you say "import and modify", do you mean that you will be storing this data separately? A linked server will update the tables directly. I have a similar setup with a Btrieve application (both FoxPro and Btrieve are using a file system for the database structure). It is rather slow working through a linked server. You may be better off using the OLEDB/ODBC driver to access the files directly. Create the DSN, then in .NET point your ADO.NET connection to this DSN. I also am using the old ADO connections in some of my .NET forms, too. It works just fine.
Linguinut
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Bill Cunnien
ConBrio Consulting