Compatibility level and writing *.txt files

I am using a script to create a text file in “my documents” folder. It works perfectly while testing it in the Editor, but when I build and run the standalone it doesn’t work anymore.

Facts:

  1. I use Unity free
  2. API compatibility level in player preferences: .NET 2.0 (not subset)
  3. There are no compilation errors or warnings

The funny thing is that my game also has scripts that use: System.IO; System.Reflection; and System.Runtime.Serialization; to create “save game files” and it works just fine.

What could be possibly going wrong?
Here is the script to create *.txt files thank you in advance:

using System;

using System.IO;
using System.Text;

public class WriteTextFile
{
static string mydocpath;
static string txtList;
static StringBuilder sb = new StringBuilder ();

public static void WriteFile ()
{
    mydocpath = Environment.GetFolderPath (Environment.SpecialFolder.MyDocuments);
    txtList = Directory.GetFiles (mydocpath, "*.txt");        

    foreach (string txtName in txtList) {
        using (StreamReader sr = new StreamReader(txtName, Encoding.GetEncoding(1252))) {
            sb.AppendLine (txtName.ToString ());
            sb.AppendLine ("= = = = = =");
            sb.Append (sr.ReadToEnd ());
            sb.AppendLine ();
            sb.AppendLine ();
        }
    }   

    using (StreamWriter outfile = new StreamWriter (mydocpath + @"\AllTxtFiles.txt", false, Encoding.GetEncoding(1252))) {

        string temp = sb.ToString ();
        outfile.Write (temp);
    }
}

}

You should have this exception in your output_log.txt in the standalone_name_Data folder:

NotSupportedException: CodePage 1252 not supported
  at System.Text.Encoding.GetEncoding (Int32 codepage) [0x00000] in <filename unknown>:0 

It is due to a missing .dll

See here: CodePage 1252 not supported - works in editor but not in standalone player - Unity Answers

Cheers.