QFile::remove() fails only on Windows?

The following code fails at dbFile.remove(), but only on Windows (at least Win7). Any clues why? I am truly sorry I cannot provide a minimal example. I thought maybe it was that the sql database is somehow still accessing the file even after I close and remove it, but I dunno. I am just frustrated and out of time and thought you experts might have conjectures.

The file in question has read/write access by the user, and the permissions are 0x6666.

The error string after dbFile.remove() is: "The process cannot access the file because it is being used by another process."

Code:

---

void Database::load()
{
...
  dbFileName = "database.sqlite"; // QString
  dbFile.setFileName(dbFileName); // QFile
  QSqlDatabase sqldb = QSqlDatabase::addDatabase("QSQLITE");
  sqldb.setDatabaseName(dbFileName);
  dbIsOpen = sqldb.open();
  dbConName = sqldb.connectionName();
...
}
 
void Database::unload()
{
  QSqlDatabase::database( dbConName, false ).close();
  QSqlDatabase::removeDatabase( dbConName );
  bool removed = dbFile.remove();
}

---