Add project files.

Pixcel.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30804.86
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Pixcel", "Pixcel\Pixcel.csproj", "{5C53F119-B7F4-4224-A90F-225D66BC5D12}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5C53F119-B7F4-4224-A90F-225D66BC5D12}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5C53F119-B7F4-4224-A90F-225D66BC5D12}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5C53F119-B7F4-4224-A90F-225D66BC5D12}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5C53F119-B7F4-4224-A90F-225D66BC5D12}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {6E63A6E5-8FB0-4A9E-9975-D0F472EB1257}
+	EndGlobalSection
+EndGlobal

Pixcel/Pixcel.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <Authors>Michaël Hompus</Authors>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <PlatformTarget>x64</PlatformTarget>
+    <CheckForOverflowUnderflow>true</CheckForOverflowUnderflow>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="EPPlus" Version="5.5.3" />
+  </ItemGroup>
+
+</Project>

Pixcel/Program.cs

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+using OfficeOpenXml;
+using OfficeOpenXml.Style;
+using System.Drawing;
+using System.IO;
+
+var source = args[0];
+
+var bitmap = new Bitmap(64, 64);
+using var graphics = Graphics.FromImage(bitmap);
+graphics.DrawImage(new Bitmap(source), 0, 0, 64, 64);
+
+ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
+using var package = new ExcelPackage(new FileInfo(source.Replace(Path.GetExtension(source), ".xlsx")));
+var worksheet = package.Workbook.Worksheets["Pixcel"] ?? package.Workbook.Worksheets.Add("Pixcel");
+
+for (int y = 1; y <= bitmap.Width; y++)
+{
+    worksheet.Column(y).Width = 5;
+
+    for (int x = 1; x <= bitmap.Height; x++)
+    {
+        worksheet.Row(x).Height = 25;
+        worksheet.Cells[x, y].Style.Fill.PatternType = ExcelFillStyle.Solid;
+        worksheet.Cells[x, y].Style.Fill.BackgroundColor.SetColor(bitmap.GetPixel(y - 1, x - 1));
+    }
+}
+
+package.Save();

Pixcel/Properties/launchSettings.json

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+{
+  "profiles": {
+    "Pixcel": {
+      "commandName": "Project",
+      "commandLineArgs": "\"C:\\Users\\micha\\Pictures\\Info Support\\Profile1000x1000.jpg\""
+    }
+  }
+}