unknown file format!

UNKNOWN FORMAT的中文是什么意思 Unknown image format code 1:later Ghost version required this AVI file format not supported什么意思? Please base on attached file format,submit the quotation This file format is not supported by the File Preview是什么意思? 请各位哥哥姐姐帮我翻译一下unknown format 的意思, fortran编程.请问：open(15,file='qaz.d',status='unknown'是什么意思? file. UVSVPPORTED-FORMAT UNKNOWN APPLICATION unknown是什么意思 cstring.format("0")是什么意思