Pessoal, bom dia!
Estou escrevendo uma rotina de controle de layers em vb.net. Uso o Visual Studio express 2010 para VB, no Windows XP 32b e NET framework 4.0
A rotina será utilizada em AutoCAD 2012 64b e 32b. Agora, está sendo testada em 64b.

Após compilar o código e gerar a DLL, quando tento carregá-la no AutoCAD usando o netload, aparece a seguinte mensagem:

Cannot load assembly. Error details: System.IO.FileLoadException: Could not
load file or assembly 'file://\\SHEILA-NOTE\Prov\setlayer.dll' or one of its
dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)
File name: 'file://\\SHEILA-NOTE\Prov\setlayer.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.
at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String
codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint,
StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean
forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName
assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean
forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.InternalLoadFrom(String assemblyFile,
Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm
hashAlgorithm, Boolean forIntrospection, Boolean suppressSecurityChecks,
StackCrawlMark& stackMark)
at System.Reflection.Assembly.LoadFrom(String assemblyFile)
at Autodesk.AutoCAD.Runtime.ExtensionLoader.Load(String fileName)
at loadmgd()

Alguem sabe o que aconteceu?
- É problema no net framework?
- tem problemas de compatibilidade entre 32 e 64b?

Obrigado pela atenção!