I see that the bug I [described in this thread](https://sqlite.org/forum/forumpost/618c868130), and for which a simple fix is shown in that same post, remains in the source for loadext.c . If it is not a bug, then the documentation for the API and SQL functions that reach sqlite3LoadExtension() needs a note added regarding the required path separator, which is always '/' for the last one now when the entry point default is taken and the given DLL location has more than a basename. If it has been recorded as a bug, I missed noticing that. (I need to learn ticket searching skills.) Amended 2020-04-26: Now fixed on trunk as of 22:04 check-in.