can't run a program with Transient Folders with Windows 10 Technical Preview Build 9841

[allenatdecisiv]

I am using the modern.IE Windows 10 with Internet Explorer 11 VirtualBox download.

I am using VirtualBox 4.3.20 r96996 on Fedora 20 x86_64.

I updated Windows 10 with the available Windows Updates.

I installed the VirtualBox Guest Additions for 4.3.20.

I changed a few of the settings as they come from Microsoft (modern.IE):

1) Chipset -> ICH9 2) Enable I/O APIC 3) IDE -> ICH6 4) switch the HD to the SATA controller

a) SATA is set to AHCI b) enable Use Host I/O Cache

Once the guest is booted, I go to Devices -> Shared Folders Settings...

I add a Transient Folders that maps to my local (ext4) Linux filesystem. A "Downloads" directory in my home directory.

I then "browse" to
VBOXSVR\Downloads in Windows Explorer.

I get the file listing.

I doulbe-click on an installer program for a PDF Viewer.

I get an error: "ShellExecuteEX failed; code 1. Incorrect function."

If I copy the file from
VBOXSVR\Downloads to a local guest directory, it runs fine.

But I have ran this same installer the same way with all of the other modern.IE VirtualBox images, i.e. running the installer from the
VBOXSVR\Downloads share works on all the other modern.IE images but Windows 10 w/IE 11.

[allenatdecisiv]

error running a program over network share "
VBOXSVR\Downloads" on Windows 10 TCP

[allenatdecisiv]

UAC prompt on Windows 8.1 running installer over network share "
VBOXSVR\Downloads"

[allenatdecisiv]

after UAC promtp on Windows 8.1