Why is XML Serializer failing to read files when running windows standalone?

I built a level saver very similar to this wiki example: http://wiki.unity3d.com/index.php?title=Saving_and_Loading_Data:_XmlSerializer

It works great in the editor, however when running a standalone version it doesn't work. Files are copied correctly to the correct directory, and I verified it as they do show up on my app's GUI correctly and the correct path is shown via Debug.Log.

On outpout_log.txt this message shows multiple times:

 (Filename: C:/BuildAgent/work/812c4f5049264fad/Runtime/ExportGenerated/StandalonePlayer/UnityEngineDebug.cpp Line: 43)
 
 ArgumentException: Encoding name **windows-1255** not supported
 
 Parameter name: name
   at System.Text.Encoding.GetEncoding (System.String name) [0x00000] in <filename unknown>:0 
 
   at System.Xml.XmlInputStream.Initialize (System.IO.Stream stream) [0x00000] in <filename unknown>:0 
 
   at System.Xml.XmlInputStream..ctor (System.IO.Stream stream) [0x00000] in <filename unknown>:0 
 
   at System.Xml.XmlStreamReader..ctor (System.IO.Stream input) [0x00000] in <filename unknown>:0 
 
   at System.Xml.XmlTextReader..ctor (System.IO.Stream input) [0x00000] in <filename unknown>:0 
 
   at System.Xml.Serialization.XmlSerializer.Deserialize (System.IO.Stream stream) [0x00000] in <filename unknown>:0 
 
   at Level.Load (System.String path) [0x00000] in <filename unknown>:0 
 
   at GameManager.SetLevel (System.String levelFileName) [0x00000] in <filename unknown>:0 
 
   at MainMenu.Update () [0x00000] in <filename unknown>:0 
  
 (Filename:  Line: -1)