Maybe try renaming the file to remove the ".x86" suffix and make sure that
directory is in the PATH?

e.g.:

    addToPath C:/full/path/to/dir/bin

I'm looking at the sample code you sent now.  It appears that the assembly
"GRPCRemoteClient" is not signed with a strong name.  This may have impact
on the type resolution.  The following appears to work:

    object create -verbose -alias "GRPCRemote.GRPCRemoteClient, GRPCRemoteClient, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" $host $port

This uses an assembly qualified name.