Problem converting EML to msg

Hi, we have purchased the following products:
Aspose.Cells for .NET Developer and
Aspose.Email for .NET Developer

We use the products to convert EML files to msg.
The problem is that if there is an msg attachement within the EML file, the msg file is after convert with aspose accessible but the attachement cannot be open.
By the same process we have no issue if the EML file did not have an attachement in msg. If other attachements within the EML file like pdf or office files there is no issue after convert from EML to msg. We have only an issue if an msg attachement is within the EML file.

Can you please give us a help.

Thanks