using remoteApp in server 2012

Hello, I'm trying to help a friend who has RemoteApp set up on their server 2012 environment. I'm not very familiar with this product. But what I can see is that it is similar to remote desktop differentiator being launches an application on their desktop rather than logging into the server. He tells me it was working at fine to launch quickbooks however now he gets the following error when trying to launch it from his laptop or from the server  "The digital signature of this RDP file cannot be verified. The remote connection cannot be started"

He gets this error regardless if he tries to launch it server itself or his laptop which is on the network. He did have one person tell him they thought he was a license issue?  

I guess am just looking for where to start?
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Cliff GaliherCommented:
RemoteApp is based on remote desktop services.  It still logs into the server on the user's behalf and launches the app on the server. Then the GUI is streamed back so it *appears* to be running locally.

To properly run RemoteApps in 2012, you really do still need to go through setting up a full RDS environment. That inclused an RDSH server, RD Licensing server, and ideally a RDCB server.  When you have this, you can simply define the remote apps in server manager and it'll create *and sign* the resulting RDP files. That is the supported way to set up RemoteApp and will resolve the signing issue you are seeing.

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Windows Server 2012

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