"Could not load file or assembly"

In some cases, the NETLOAD command does not load the DLL and displays this error on the command line:

Cannot load assembly. Error details: System.IO.FileLoadException: Could not load file or assembly 'file:///C:\TBN2CAD\TBN2CAD.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515) File name: 'file:///C:\TBN2CAD\TBN2CAD.dll ' ---> System.NotSupportedException: An attempt was made to load an assembly from a network location which would have caused the assembly to be sandboxed in previous versions of the .NET Framework. This release of the .NET Framework does not enable CAS policy by default, so this load may be dangerous. If this load is not intended to sandbox the assembly, please enable the loadFromRemoteSources switch. See http://go.microsoft.com/fwlink/?LinkId=155569 for more information.

To correct this error, try this procedure first..

If that does not work, quit AutoCAD and locate the file: C:\Program Files\Autodesk\AutoCAD\Acad.exe.Config

Change your properties to read and write:

Open with Notepad and include this:


    <loadFromRemoteSources enabled="true"/>


It should stay that way:


  <startup useLegacyV2RuntimeActivationPolicy="true">

    <supportedRuntime version="v4.0"/>



    <loadFromRemoteSources enabled="true"/>




      <source name="System.Windows.Data" switchName="SourceSwitch">


          <remove name="Default" />






Save, open AutoCAD and try NETLOAD again.