Add project files.

App.xaml

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+<Application x:Class="Txt2Bib.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:Txt2Bib"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace Txt2Bib
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

MainWindow.xaml

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+<Window x:Class="Txt2Bib.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Txt2Bib"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="900" Width="800">
+    <Grid Background="#FF38383E">
+        <TextBox x:Name="DropArea" HorizontalAlignment="Left" Margin="48,82,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="431" Height="295" PreviewDragEnter="DropArea_PreviewDragEnter" PreviewDragOver="DropArea_PreviewDragOver" Drop="DropArea_Drop"/>
+        <TextBox x:Name="Debug" HorizontalAlignment="Left" Margin="48,422,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="710" Height="429" RenderTransformOrigin="0.449,1.525"/>
+        <Label Content="Txt2Bib" HorizontalAlignment="Center" Margin="0,10,0,0" VerticalAlignment="Top" Foreground="White" FontFamily="DejaVu Sans Light" FontSize="28"/>
+        <Button x:Name="GoBtn" Content="Genera" HorizontalAlignment="Left" Margin="594,160,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.5,0.5" Height="83" Width="131" Click="GoBtn_Click" BorderBrush="{x:Null}" Foreground="White" Background="#FF474671" FontFamily="Cascadia Code" FontSize="16">
+            <Button.RenderTransform>
+                <TransformGroup>
+                    <ScaleTransform/>
+                    <SkewTransform/>
+                    <RotateTransform Angle="-0.415"/>
+                    <TranslateTransform/>
+                </TransformGroup>
+            </Button.RenderTransform>
+        </Button>
+
+    </Grid>
+</Window>

MainWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace Txt2Bib
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+            DropArea.AllowDrop = true;
+        }
+
+        private void DropArea_Drop(object sender, DragEventArgs e)
+        {
+            // Get data object
+            var dataObject = e.Data as DataObject;
+
+            if (dataObject == null )
+            {
+                MessageBox.Show("Nessun percorso disponibile...");
+                return;
+            }
+
+            // Check for file list
+            if (dataObject.ContainsFileDropList())
+            {
+                // Clear values
+                DropArea.Text = string.Empty;
+
+                // Process file names
+                var fileNames = dataObject.GetFileDropList();
+                StringBuilder bd = new StringBuilder();
+                foreach (var fileName in fileNames)
+                {
+                    bd.Append(fileName + "\n");
+                }
+                // Set text
+                DropArea.Text = bd.ToString();
+            }
+        }
+
+        private void DropArea_PreviewDragEnter(object sender, DragEventArgs e)
+        {
+            if (e.Data.GetDataPresent(DataFormats.FileDrop))
+            {
+                e.Effects = DragDropEffects.Copy;
+            }
+            else
+            {
+                e.Effects = DragDropEffects.None;
+            }
+        }
+
+        private void DropArea_PreviewDragOver(object sender, DragEventArgs e)
+        {
+            e.Handled = true;
+        }
+
+        private void GoBtn_Click(object sender, RoutedEventArgs e)
+        {
+            var txt2bib = new Text2Bib();
+            Debug.Text = txt2bib.Generate(DropArea.Text);
+        }
+    }
+}

Text2Bib.cs

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+using System;
+using System.IO;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Controls.Primitives;
+using System.Windows;
+
+namespace Txt2Bib
+{
+    internal class Text2Bib
+    {
+        public string Generate(string filenames)
+        {
+            var paths = filenames.Trim().Split('\n');
+            string result = "";
+            string output = "";
+
+            foreach (var path in paths)
+            {
+                var reader = File.OpenText(path);
+                byte[] contentBytes = File.ReadAllBytes(path);
+
+                result += Encoding.Latin1.GetString(contentBytes);
+                // How to determine actual encoding??
+                /*
+                result += reader.CurrentEncoding.CodePage switch
+                {
+                    65001 => Encoding.UTF8.GetString(contentBytes),
+                    _ => Encoding.Latin1.GetString(contentBytes)
+                }; 
+                */
+                
+            }
+
+            //TODO process entry
+            foreach (string item in result.Split('%'))
+            {
+                output += item;
+            }
+
+            return output;
+        }
+    }
+}

Txt2Bib.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+</Project>

Txt2Bib.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.6.33712.159
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Txt2Bib", "Txt2Bib.csproj", "{FDD15141-8C8B-4499-B0CE-569228109AAD}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{FDD15141-8C8B-4499-B0CE-569228109AAD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FDD15141-8C8B-4499-B0CE-569228109AAD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FDD15141-8C8B-4499-B0CE-569228109AAD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FDD15141-8C8B-4499-B0CE-569228109AAD}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A9ECFA8F-BFA3-49CD-B5E8-BB8E1255596D}
+	EndGlobalSection
+EndGlobal