diff --git a/phpBB/download/file.php b/phpBB/download/file.php
index 9ee489cef4..6d0796d2c4 100644
--- a/phpBB/download/file.php
+++ b/phpBB/download/file.php
@@ -257,11 +257,6 @@ else
 		$display_cat = ATTACHMENT_CATEGORY_NONE;
 	}
 
-	if ($display_cat == ATTACHMENT_CATEGORY_FLASH && !$user->optionget('viewflash'))
-	{
-		$display_cat = ATTACHMENT_CATEGORY_NONE;
-	}
-
 	/**
 	* Event to modify data before sending file to browser
 	*
diff --git a/phpBB/includes/acp/acp_attachments.php b/phpBB/includes/acp/acp_attachments.php
index 5b1db5c31b..5557ecc835 100644
--- a/phpBB/includes/acp/acp_attachments.php
+++ b/phpBB/includes/acp/acp_attachments.php
@@ -606,7 +606,6 @@ class acp_attachments
 				$cat_lang = array(
 					ATTACHMENT_CATEGORY_NONE		=> $user->lang['NO_FILE_CAT'],
 					ATTACHMENT_CATEGORY_IMAGE		=> $user->lang['CAT_IMAGES'],
-					ATTACHMENT_CATEGORY_FLASH		=> $user->lang['CAT_FLASH_FILES'],
 				);
 
 				$group_id = $request->variable('g', 0);
@@ -1385,7 +1384,6 @@ class acp_attachments
 		$types = array(
 			ATTACHMENT_CATEGORY_NONE		=> $user->lang['NO_FILE_CAT'],
 			ATTACHMENT_CATEGORY_IMAGE		=> $user->lang['CAT_IMAGES'],
-			ATTACHMENT_CATEGORY_FLASH		=> $user->lang['CAT_FLASH_FILES'],
 		);
 
 		if ($group_id)
diff --git a/phpBB/includes/functions_content.php b/phpBB/includes/functions_content.php
index a15a03f966..05e9233240 100644
--- a/phpBB/includes/functions_content.php
+++ b/phpBB/includes/functions_content.php
@@ -1245,11 +1245,6 @@ function parse_attachments($forum_id, &$message, &$attachments, &$update_count_a
 				$display_cat = ATTACHMENT_CATEGORY_NONE;
 			}
 
-			if ($display_cat == ATTACHMENT_CATEGORY_FLASH && !$user->optionget('viewflash'))
-			{
-				$display_cat = ATTACHMENT_CATEGORY_NONE;
-			}
-
 			$download_link = append_sid("{$phpbb_root_path}download/file.$phpEx", 'id=' . $attachment['attach_id']);
 			$l_downloaded_viewed = 'VIEWED_COUNTS';
 
@@ -1281,21 +1276,6 @@ function parse_attachments($forum_id, &$message, &$attachments, &$update_count_a
 					$update_count_ary[] = $attachment['attach_id'];
 				break;
 
-				// Macromedia Flash Files
-				case ATTACHMENT_CATEGORY_FLASH:
-					list($width, $height) = @getimagesize($filename);
-
-					$block_array += array(
-						'S_FLASH_FILE'	=> true,
-						'WIDTH'			=> $width,
-						'HEIGHT'		=> $height,
-						'U_VIEW_LINK'	=> $download_link . '&view=1',
-					);
-
-					// Viewed/Heared File ... update the download count
-					$update_count_ary[] = $attachment['attach_id'];
-				break;
-
 				default:
 					$l_downloaded_viewed = 'DOWNLOAD_COUNTS';
 
diff --git a/phpBB/includes/functions_download.php b/phpBB/includes/functions_download.php
index 7be12baa13..447e89c3bc 100644
--- a/phpBB/includes/functions_download.php
+++ b/phpBB/includes/functions_download.php
@@ -206,28 +206,20 @@ function send_file_to_browser($attachment, $upload_dir, $category)
 		header('X-Content-Type-Options: nosniff');
 	}
 
-	if ($category == ATTACHMENT_CATEGORY_FLASH && $request->variable('view', 0) === 1)
+	if (empty($user->browser) || ((strpos(strtolower($user->browser), 'msie') !== false) && !phpbb_is_greater_ie_version($user->browser, 7)))
 	{
-		// We use content-disposition: inline for flash files and view=1 to let it correctly play with flash player 10 - any other disposition will fail to play inline
-		header('Content-Disposition: inline');
+		header('Content-Disposition: attachment; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
+		if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie 6.0') !== false))
+		{
+			header('Expires: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
+		}
 	}
 	else
 	{
-		if (empty($user->browser) || ((strpos(strtolower($user->browser), 'msie') !== false) && !phpbb_is_greater_ie_version($user->browser, 7)))
+		header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
+		if (phpbb_is_greater_ie_version($user->browser, 7) && (strpos($attachment['mimetype'], 'image') !== 0))
 		{
-			header('Content-Disposition: attachment; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
-			if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie 6.0') !== false))
-			{
-				header('Expires: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
-			}
-		}
-		else
-		{
-			header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
-			if (phpbb_is_greater_ie_version($user->browser, 7) && (strpos($attachment['mimetype'], 'image') !== 0))
-			{
-				header('X-Download-Options: noopen');
-			}
+			header('X-Download-Options: noopen');
 		}
 	}
 
diff --git a/phpBB/install/convertors/functions_phpbb20.php b/phpBB/install/convertors/functions_phpbb20.php
index 2da901d3de..69dc7bb4bc 100644
--- a/phpBB/install/convertors/functions_phpbb20.php
+++ b/phpBB/install/convertors/functions_phpbb20.php
@@ -1399,10 +1399,6 @@ function phpbb_attachment_category($cat_id)
 		case 2:
 			return ATTACHMENT_CATEGORY_WM;
 		break;
-
-		case 3:
-			return ATTACHMENT_CATEGORY_FLASH;
-		break;
 	}
 
 	return ATTACHMENT_CATEGORY_NONE;
diff --git a/phpBB/language/en/acp/attachments.php b/phpBB/language/en/acp/attachments.php
index 86430f46bd..67454f8b76 100644
--- a/phpBB/language/en/acp/attachments.php
+++ b/phpBB/language/en/acp/attachments.php
@@ -68,7 +68,6 @@ $lang = array_merge($lang, array(
 	'ATTACH_QUOTA_EXPLAIN'				=> 'Maximum drive space available for attachments for the whole board, with 0 being unlimited.',
 	'ATTACH_TO_POST'					=> 'Attach file to post',
 
-	'CAT_FLASH_FILES'			=> 'Flash files',
 	'CAT_IMAGES'				=> 'Images',
 	'CHECK_CONTENT'				=> 'Check attachment files',
 	'CHECK_CONTENT_EXPLAIN'		=> 'Some browsers can be tricked to assume an incorrect mimetype for uploaded files. This option ensures that such files likely to cause this are rejected.',
@@ -99,7 +98,6 @@ $lang = array_merge($lang, array(
 	'EXT_GROUP_ARCHIVES'			=> 'Archives',
 	'EXT_GROUP_DOCUMENTS'			=> 'Documents',
 	'EXT_GROUP_DOWNLOADABLE_FILES'	=> 'Downloadable Files',
-	'EXT_GROUP_FLASH_FILES'			=> 'Flash Files',
 	'EXT_GROUP_IMAGES'				=> 'Images',
 	'EXT_GROUP_PLAIN_TEXT'			=> 'Plain Text',