Error after upgrade (#39)

After upgrade to version 5.10 (from 5.06), I cannot open any projects createds won version 5.06.

Error showed on software startup:

System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\Administrator\AppData\Local\Temp\SIM\kqrvz23x.ovi'.

at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)

at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)

at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)

at System.IO.File.WriteAllBytes(String path, Byte[] bytes)

at SoftwareIdeasModeler.ProjectXml.SimXmlReader.LoadImage(Project project, XElement imageElem)

at SoftwareIdeasModeler.Core.Projecting.ConcreteDiagramItem.Load(Diagram diagram, XElement elem)

at SoftwareIdeasModeler.Core.Projecting.DiagramLayer.Load(Diagram diagram, XElement xElem)

at SoftwareIdeasModeler.Core.Projecting.Diagram.LoadItems(Diagram diagram, XElement elem)

at SoftwareIdeasModeler.Core.Projecting.Diagram.FromXElement(SimXmlReader reader, Model model, XElement elem)

at SoftwareIdeasModeler.Core.Projecting.Model.FromXElement(SimXmlReader reader, Project project, XElement elem)

at SoftwareIdeasModeler.ProjectXml.SimXmlReader.LoadModels(XElement root)

at SoftwareIdeasModeler.ProjectXml.SimXmlReader.Load()

at SoftwareIdeasModeler.Program.RunMainWindow(Form splash)