This attribute throws an error if there is an attempt to submit a file with an extension that is listed as a value of that attribute.
当试图提交和该属性值中列出的扩展名一致的文件时，该属性将抛出一个错误。
2
Rather than simply proclaiming "ERROR 6534," the error message can explain, "Please reference error number 6534 if you address this problem with the help desk at extension 555."