If I open a Query tab, and click the "Load SQL file.." button, and the file/data is too large for the tab window, it offers to run the SQL directly... that's fine and it all works.
However, it doesn't seem to release the handle on the file when it's finished. If I try to delete the file in Windows File Manager I get a messagebox telling me that it is "being used by another process" and I have to close Heidi before it will let me do so.
So... nothing major, but...