<?php $db = new SQLite3(':memory:'); $rs = $db->query('SELECT sqlite_version()'); while ($row = $rs->fetchArray()) print "<h3>SQLite version: $row</h3>"; $db->query("SELECT load_extension('cvtab.dll','sqlite3_cvtab_init');"); //Attempting to load this way errors as follows: //Warning: SQLite3::query(): not authorized in C:\DL\PHP\QTests.php on line 8 $db->loadExtension('cvtab.dll'); //Attempting to load this way errors as follows: //Warning: SQLite3::loadExtension(): Unable to load extension at //'ext\cvtab.dll' in C:\DL\PHP\QTests.php on line 11 ?> The custom VT loads perfectly fine using the latest windows CLI downloaded from the SQLite website and using and an old sqlite version 3-8-1 20131017 CLI. The PHP SQLite version reported by the version query in the script is: 18.104.22.168, The one bundled with PHP 5.6.40, unfortunately none of the newer PHPs work on stock windows 8.1. Both PHP (php-5.6.40-nts-Win32-VC11-x86.zip) and the custom VT dll are 32 bit, not sure if thread safety in the custom dll will cause this failure... I have the PHP built-in development server running under command prompt as Administrator. php.ini have both these enabled/set: extension=php_sqlite3.dll sqlite3.extension_dir = "ext" "ext\cvtab.dll" does exist. Any pointers MUCH appreciated!!!