That is one of the backups that Mach makes, you are looking in the backup folder but the one you really want (current one) is in the main Mach3 folder, not the backup folder.
You can attach by using the additional options button on the reply page, yo will need to rename the xml first though as the forum only accepts a file name once, so copy to your desktop, rename to GeoffFord.xml and attach.
Hood