1. ensure that you are saving the logs in the correct format, ANSI (see image), if you hadn't done that the file size could be much larger (and not easily read either).
2. if it is in ANSI format and is still greater 200KB (max for total of files attached) per post. You can attach one file per post if needs be.
If a single file is greater than that:
You can use a file sharing site such as Mediafire.com - Upload to
http://www.mediafire.com/ and post the sharing link.