Where does sqlite3_open create the db?

Question

SQLite

Good afternoon, I have the following question (stupid?):
There is an MFC Smart Device project, sqlite3 is connected to it, and so, where is this database created by the sqlite3_open("test.db", & db) function? In a desktop project, it is created in the folder with the project itself, but here it is not created at all (search in the file system does not find it), but at the same time I can work with it (write / read data). The sqlite.org documentation does not describe the situation for a smart device.
Oh yes, there is no sqlite3_db_filename () function in the mobile assembly (as I understand it)