diff --git a/install/sql/mysql.sql b/install/sql/mysql.sql
index 6893dcdc..068a04de 100644
--- a/install/sql/mysql.sql
+++ b/install/sql/mysql.sql
@@ -633,9 +633,6 @@ INSERT INTO `bb_extensions` VALUES ('', '3', 'h', '');
 INSERT INTO `bb_extensions` VALUES ('', '3', 'cpp', '');
 INSERT INTO `bb_extensions` VALUES ('', '3', 'hpp', '');
 INSERT INTO `bb_extensions` VALUES ('', '3', 'diz', '');
-INSERT INTO `bb_extensions` VALUES ('', '4', 'tif', '');
-INSERT INTO `bb_extensions` VALUES ('', '4', 'tiff', '');
-INSERT INTO `bb_extensions` VALUES ('', '4', 'tga', '');
 INSERT INTO `bb_extensions` VALUES ('', '4', 'xls', '');
 INSERT INTO `bb_extensions` VALUES ('', '4', 'doc', '');
 INSERT INTO `bb_extensions` VALUES ('', '4', 'dot', '');
diff --git a/install/upgrade/changes.txt b/install/upgrade/changes.txt
index 86f635a1..f90c7da4 100644
--- a/install/upgrade/changes.txt
+++ b/install/upgrade/changes.txt
@@ -119,3 +119,8 @@ ALTER TABLE `bb_bt_tracker` CHANGE `speed_up` `speed_up` int(11) unsigned NOT NU
 ALTER TABLE `bb_bt_tracker` CHANGE `speed_down` `speed_down` int(11) unsigned NOT NULL DEFAULT '0';
 ALTER TABLE `bb_bt_tracker_snap` CHANGE `speed_up` `speed_up` int(11) unsigned NOT NULL DEFAULT '0';
 ALTER TABLE `bb_bt_tracker_snap` CHANGE `speed_down` `speed_down` int(11) unsigned NOT NULL DEFAULT '0';
+
+// 2.1.5 (LTS 2024.01)
+DELETE FROM `bb_extensions` WHERE `extension` = 'tga';
+DELETE FROM `bb_extensions` WHERE `extension` = 'tif';
+DELETE FROM `bb_extensions` WHERE `extension` = 'tiff';
diff --git a/library/attach_mod/includes/functions_thumbs.php b/library/attach_mod/includes/functions_thumbs.php
index a8b95634..3a24639f 100644
--- a/library/attach_mod/includes/functions_thumbs.php
+++ b/library/attach_mod/includes/functions_thumbs.php
@@ -62,19 +62,11 @@ function get_supported_image_types($type)
 				$new_type = ($format & IMG_GIF) ? IMG_GIF : 0;
 				break;
 			case IMAGETYPE_JPEG:
-			case IMAGETYPE_JPC:
-			case IMAGETYPE_JP2:
-			case IMAGETYPE_JPX:
-			case IMAGETYPE_JB2:
 				$new_type = ($format & IMG_JPG) ? IMG_JPG : 0;
 				break;
 			case IMAGETYPE_PNG:
 				$new_type = ($format & IMG_PNG) ? IMG_PNG : 0;
 				break;
-			case IMAGETYPE_BMP:
-			case IMAGETYPE_WBMP:
-				$new_type = ($format & IMG_WBMP) ? IMG_WBMP : 0;
-				break;
 		}
 
 		return array(
@@ -142,9 +134,6 @@ function create_thumbnail($source, $new_file, $mimetype)
 				case IMG_PNG:
 					$image = imagecreatefrompng($source);
 					break;
-				case IMG_WBMP:
-					$image = imagecreatefromwbmp($source);
-					break;
 			}
 
 			if ($type['version'] == 1 || !$attach_config['use_gd2'])
@@ -169,9 +158,6 @@ function create_thumbnail($source, $new_file, $mimetype)
 				case IMG_PNG:
 					imagepng($new_image, $new_file);
 					break;
-				case IMG_WBMP:
-					imagewbmp($new_image, $new_file);
-					break;
 			}
 
 			imagedestroy($new_image);
diff --git a/library/config.php b/library/config.php
index b36572d5..84265550 100644
--- a/library/config.php
+++ b/library/config.php
@@ -531,10 +531,9 @@ $bb_cfg['file_id_ext'] = array(
 	4 => 'png',
 	5 => 'rar',
 	6 => 'tar',
-#	7 => 'tiff',
 	8 => 'torrent',
 	9 => 'zip',
-	10 => '7z'
+	999 => '7z'
 );
 
 // Attachments