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Does any know how to get the RDP version Windows is running with?

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Or you could Right click on the window and select About enter image description here

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Windows RDP uses the executable mstsc.exe located in c:\windows\system32

Simply right click on this file, and go to properties, then click the version tab.

hope this helps.

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I like this answer the best because the exe's property details will tell you the full, where as About just has I'm not sure why you might ever need the revision number, but I'm all for the extra info. – DanM7 Aug 20 '13 at 18:16
But it doesn't tell you what RDP protocol is supported. For example, mstsc version 6.x supports RDP protocol 7 and 8.1 – Jonathan Leaders Feb 13 '15 at 8:40

or you could also click Start > Run > mstsc and when you see the Remote Desktop Connection window appear, click the top left hand corner "computer" icon and select "About".

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wmic datafile where name="C:\\\windows\\\system32\\\mstsc.exe" get manufacturer, name, version
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There can be maybe better way with PowerShell.

First one need complete table of MSTSC build numbers and just compare to output of:

(Get-Item C:\Windows\System32\mstsc.exe).VersionInfo.FileVersion

And the second one is to read CLSID of registered components which contain also RDP binaries, like that:

$Current = 0
$GUID = Get-ChildItem -LiteralPath "Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID" | Select Name
$GUIDNum = Get-ChildItem -LiteralPath "Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID" | Select Name | Measure
While($Current -ne $GUIDNum.Count) {
$Path = $GUID[$Current] | Select -ExpandProperty Name
$GUIDName = ((get-itemproperty -literalpath "Registry::$Path").'(default)') 
If ($GUIDName -like 'Microsoft RDP Client Control (redistributable) - version*')
Write-Host $GUIDName
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