read an excel file works only in the editor,not in the build

hello, here's my code for read from excel file. editor works fine but in the build the excel file is not read.

when i work in the editor the file is in the folder

 c:\projectname\1.xls

in the build:

 c:\1.xls
 c:\project_Data\ 1.xls


 using UnityEngine;
 using System.Collections;
 using System; 
 using System.Data; 
 using System.Data.Odbc; 
 
 public class ExcelReader : MonoBehaviour
 {
     String something;
     public String Filename="1";
     
     void Start ()
     {
         readXLS(Filename); 
     }
  
     void readXLS(String Filename)
     {
         // Must be saved as excel 2003 workbook, not 2007, mono issue really
         string con = "Driver={Microsoft Excel Driver (*.xls)}; DriverId=790; Dbq="+Filename+";";
         string yourQuery = "SELECT * FROM [Foglio1$]"; 

         OdbcConnection oCon = new OdbcConnection(con); 
         
         OdbcCommand oCmd = new OdbcCommand(yourQuery, oCon);

         DataTable dtYourData = new DataTable("YourData"); 
         
         oCon.Open(); 
         
         OdbcDataReader rData = oCmd.ExecuteReader(); 
         
         dtYourData.Load(rData); 
         
         rData.Close(); 
         
         oCon.Close(); 
         
         if(dtYourData.Rows.Count > 0) 
         { 
             prova = dtYourData.Rows[0][dtYourData.Columns[1].ColumnName].ToString(); 
             if (something == "DESTROY!")
                 Destroy(GameObject.Find("Cube"));
             print(something);
         }
     }
 }