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If you want to attach a jpg file using IE7 you get an error that you uploaded an invalid file.

Fix:
Open inc/functions_upload.php and search for (Lines 154-159):

		case "image/jpeg":
		case "image/x-jpg":
		case "image/x-jpeg":
		case "image/pjpeg":
			$img_type = 2;
			break;

Replace with:

		case "image/jpeg":
		case "image/x-jpg":
		case "image/x-jpeg":
		case "image/pjpeg":
		case "image/jpg":
			$img_type = 2;
			break;

You have to add the mime-type image/jpg. Do the same in the lines 330 - 335.

This bug has been fixed in the latest code.

Please note the latest code is not live on the site or for download. An update will be released which contains this fix.