First working version

BattleSim.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31025.194
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BattleSim", "BattleSim\BattleSim.csproj", "{C9EDF5F6-D7FB-4F7B-B09A-FC98DE9688DD}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C9EDF5F6-D7FB-4F7B-B09A-FC98DE9688DD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C9EDF5F6-D7FB-4F7B-B09A-FC98DE9688DD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C9EDF5F6-D7FB-4F7B-B09A-FC98DE9688DD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C9EDF5F6-D7FB-4F7B-B09A-FC98DE9688DD}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {6D565D1C-11FF-47D9-B331-5896611E1601}
+	EndGlobalSection
+EndGlobal

BattleSim/BattleSim.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <UseWindowsForms>true</UseWindowsForms>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Update="Properties\Resources.Designer.cs">
+      <DesignTime>True</DesignTime>
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Update="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+  </ItemGroup>
+
+</Project>

BattleSim/BattleSim.csproj.user

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Compile Update="FRM_BattleSim.cs">
+      <SubType>Form</SubType>
+    </Compile>
+  </ItemGroup>
+</Project>