Embedded file system and sqlite

I am working on an embedded project that has no filesystem and our database snippet has functionality. Now it is so ineffective that we cannot take it any longer.

I'm trying to figure out if there is built-in flat file system support in SQLite. I've dug up http://sqlite.org for a long time but haven't found anything specific covering it. Has anyone found a supported implementation written in C? It looks like such a simple query, but I can't find anything about it.

We have enough memory. In an ideal world, I would just strip out most of it, pass FS to the pointer, and then provide the FS / SQLite library with just what it needs.