憎恶的英文:请问以下这段话怎么翻译？

Many thanks for your mail, which brought me a lot of information. However, I cannot open the file (.dat) attached in your mail. I wonder what format the attachment is. Thank you!

Thanks for your letter!I got a lot of information from it.Thanks again! But I have a problem, in your mail, there is an attachment named DAT ,which I cannot open. Could tell me what it is? Many thanks.

Thank you for your letter! I know a lot of information. But I still have a question in your letter with one.Dat annex, but I can not open, ask what is the nature of this annex? Thank you!

谢谢你的来信，非常感谢！我了解了很多信息。但我还有一个问题，在您的来信中带有一个.dat的附件，但是我没有办法打开，想请问这个附件是什么性质的？谢谢！
Thank you for your letter! Thus, I have known much information. However,there's another doubt, in your letter, there's a .dat file attached in the mail which I can't open it successfully,I wonder what kind of the file belongs to? Thank you !

thanks for your mail very much, now I know a lot about this.I still have a question, there is a DAT format file attached in your mail, but I can't open it. I would like to ask you how to solve this problem. Thank you

I really appreciate your letter for I got much knowledge. Besides, I also got a problem from the mail. There is an enclosed .dat file, but I could not open it. Would you pls tell me the format of the attachment. Thanks a lot!