Greek name of picture problem

Hi unity developers.

Really need your help on this matter.

I am rather new on Unity development but after searching for the solution online I couldn't find anything on this.

I am saving a screenshot as a png file to save a model greated in my game.

Then to reload the model I create a list of buttons with the picture of each model inside it.

The problem is when I have saved a model with a greek name ("τεστ") the button does not show the image but a small question mark, like is not finding the picture "τεστ.png".

I read the directory of the saved models and save each picure in an array using the following code:

 var info = new DirectoryInfo(Application.dataPath+"/Resources/ModelsLibrary/");
     var fileInfo = info.GetFiles("*.png");
     libraryModelImages = new Texture2D[0];
     libraryModelNames = new String[0];
     for (file in fileInfo){
         var texName:String = file.Name.Substring(0,file.Name.Length-4);
         var compositeName = modelsDirectory+texName;
         //var aTexture:Texture2D = Resources.Load(compositeName,Texture2D);
         
         var aTexture:Texture2D = startupScript.loadTex(Application.dataPath+"/Resources/"+modelsDirectory+file.Name);
         aTexture.name = texName;
         libraryModelImages += [aTexture];
         Debug.Log("Model name: "+libraryModelImages.name);
         libraryModelNames += [texName];
     }

where "Debug.Log("Model name: "+libraryModelImages.name);" shows the name in greek just fine and later show the list of model with pictures on buttons like this:

 var modelButtonRect:Rect = Rect(25,25,128,64);
 
     for (idx=0;idx<libraryModelImages.length;idx++){
         Debug.Log("model name:"+libraryModelImages[idx]);
         //MODELS BUTTONS
         if (GUI.Button(modelButtonRect,libraryModelImages[idx])){
             selectedModelIdx = idx;
             textFieldString = libraryModelNames[selectedModelIdx];
             //Debug.Log("dblClick:"+dblClick);
             if(dblClick){
                 var allPieces = GameObject.FindGameObjectsWithTag("Piece");
                 for (var piece in allPieces){
                         startupScript.destroyPiece(piece);
                 }
                 loadModel(false,null);    
                 modelsLibraryWindow = false;
             }
             
             
         }
 
         //adjust button rectangles for rows and columns
         modelButtonRect.x += 135;
         if (modelButtonRect.x> 500){
             modelButtonRect.x = 25;
             modelButtonRect.y += 71;
         }
     }

In the above code "Debug.Log("model name:"+libraryModelImages[idx]);" also shows the grek name of the file, but it does load it.

So what am I doing wrong? Can I fix it?