Tracey Beanz apparently knows this file and made videos about it in Oct 16. She reported today (alongside others), that it's material from the Guccifer 2.0 leak from October 2016.

She also said that the Guccifer 2.0 material was actually a leak by the DNC to back up the 'Russian's did it' narrative, and they made sure it contained no incriminating information.

Tracey's excellent video from today - https://www.youtube.com/watch?v=KSGgsanhC3E

Defango also reported the same as Tracey yesterday and today, re the file being the Guccifer 2.0 leak from Oct 2016.

Video from yesterday - https://www.youtube.com/watch?v=NrsiAlL5XX4

Video from today - https://www.youtube.com/watch?v=a45R0cuJpNI

Defango has a few videos on the subject created yesterday and today - https://www.youtube.com/user/defango/videos

I think we can deduce therefore that Webb has released an old file, one which was leaked on purpose by the DNC.