GPO to Open Files on the new Edge WITHOUT saving first. REQUIRED for Kiosks (Always Open in System)

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Contributor

We have thousands of Health Kiosks running in hospitals that are running IE 11.
We want to upgrade them to Edge Chromium.

We have tons of Group Policies restricting the "saving" of documents outside the "temporary internet files" which is the ONLY allowed location.

Users are trying to fill out forms in PDF. They are required to use Adobe PDF for the advanced features. 

In IE they could click "OPEN" and it would download into the Temporary Internet Files hidden folder and then Open in Adobe PDF (not active x but full Adobe PDF program).

In Edge it seems to want to force a download and does not give an option to open in the Temporary Internet Files and allow them to Edit the form and then print?

Please setup Edge to NOT try and Save but allow users to "open" like IE does.

Edge has the option to "Always Open in PDF Viewer" but it doesn't appear to be a group policy.
What is the registry key for it?  I Found open_pdf_in_system_reader":true} in the preferences file but that is useless to me.

When I set Always Open PDF Files Externally it won't download them to Temporary Internet Files. If i unlock c:\ it will download but then when I click on it, it says "Cannot open PDF in Edge - Disable PDF files externally" even though Adobe Reader is the Default PDF handler.

I have even setup the Default Download Directory to force it to Temporary Internet Files and NEVER ask user where to save and it still pops up trying to save to Downloads or Desktop which are blocked.