Thanks for reporting the issue.
Verified that the report reporos for all the reported extensions.

I'm focusing on some other work at the moment but I'll come back to this on or before 10/12. Sorry for the delay here.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8add59a69da35f2cc0c3585fa44cac696a3d003c

commit 8add59a69da35f2cc0c3585fa44cac696a3d003c
Author: Nathan Parker <nparker@chromium.org>
Date: Fri Oct 27 23:07:31 2017

Add a number of new download_file_types, and some enums we were missing.

Add btapp, btbtskin, btkey, btinstasll, btsearch,
    dhtml, dhtm, dht, shtml, shtm, sht, vdx, vsx,
    vtx, vsdx, vssx, vstx, vsdm, vssm, vstm.

Fix up enums that weren't correct before, an remove some platform_settings
that are set to the defaults anyway.

Bug:  771469 ,  767502 ,  762702 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I4114c35e3f1a56a067f9b61bb54bfe3a8a801531
Reviewed-on: https://chromium-review.googlesource.com/736161
Commit-Queue: Nathan Parker <nparker@chromium.org>
Reviewed-by: Luke Z <lpz@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512338}
[modify] https://crrev.com/8add59a69da35f2cc0c3585fa44cac696a3d003c/chrome/browser/resources/safe_browsing/download_file_types.asciipb
[modify] https://crrev.com/8add59a69da35f2cc0c3585fa44cac696a3d003c/content/browser/download/download_stats.cc
[modify] https://crrev.com/8add59a69da35f2cc0c3585fa44cac696a3d003c/tools/metrics/histograms/enums.xml

Pushed via component update.

i was wondering if this bug qualifies for the Chrome Reward Program?

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Re #c8: Unfortunately reporting file extensions that we don't send the ping for does not qualify for a VRP reward under the rules of the VRP program:

From https://www.google.com/about/appsecurity/chrome-rewards/index.html
"The extension of the binary file must be one of those that Chrome already tracks. This list can be found here: download_file_types.asciipb"