6.10 has been released.Sorry if I'm not clear with the original post, the issue occurs in RouterOS version 6.9 only from I've seen. 6.7 seemed to work okay.
So i understand from your words that i'm right ?Email firstname.lastname@example.org.
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i do not understand you ,This will block everything, not just file extensions. It will block any page that mentions ".dat" in it's text. Not just the downloads.