Digital Persona mot work over vWorkspace Session

hi,

I have the following problem:
I'm working with a reader fingerprinter Digital Persona 4000B.
install the drivers on the client computer and the virtual desktop.
If access to your desktop via usb rdp without redirecting the reader fingerprinter operates smoothly.
if access to the desktop via vWorkspace client without redirect usb, the fingerprinter reader does not work.
if access to the desktop via vWorkspace client and redirected the usb, the fingerprinter reader does not work.

to operate via rdp I add the following registry key on the client computer:

[HKEY_CURRENT_USER \ Software \ Microsoft \ Terminal Server Client \ Default \ Addins \ DPRDP]
"Name" = "C: \\ Program Files \\ Bin \\ \\ DigitalPersona DpTsClnt.dll"

and tried to add the following to operate the vWorkspace client without success:

[HKEY_CURRENT_USER \ Software \ Microsoft \ Terminal Server Client \ Default \ Addins \ DPRDP]
"Name" = "C: \\ Program Files \\ Bin \\ \\ DigitalPersona DpTsClnt.dll"

[HKEY_LOCAL_MACHINE \ SOFTWARE \ Provision Networks \ Terminal Services Client \ Addins \ DPRDP]
"Name" = "C: \\ Program Files \\ Bin \\ \\ DigitalPersona DpTsClnt.dll"

[HKEY_LOCAL_MACHINE \ SOFTWARE \ Wow6432Node \ Provision Networks \ Terminal Services Client \ Addins \ DPRDP]
"Name" = "C: \\ Program Files \\ Bin \\ \\ DigitalPersona DpTsClnt.dll"

[HKEY_CURRENT_USER \ SOFTWARE \ Provision Networks \ Terminal Services Client \ Addins \ DPRDP]
"Name" = "C: \\ Program Files \\ Bin \\ \\ DigitalPersona DpTsClnt.dll"

[HKEY_CURRENT_USER \ SOFTWARE \ Wow6432Node \ Provision Networks \ Terminal Services Client \ Addins \ DPRDP]
"Name" = "C: \\ Program Files \\ Bin \\ \\ DigitalPersona DpTsClnt.dll"

any idea ???