Update to support ARM64 build target

[jamescharters]

Fixes: [issue-number]

Summary: [summary of the change and which issue is fixed here]

This change introduces full ARM64 support for CefSharp, covering native C++/CLI projects, managed .NET Framework projects, NuGet packaging, and the build pipeline. It enables CefSharp to be built and distributed for Windows ARM64 devices natively.

Changes: [specify the structures changed]

• Added ArchitectureHelper.cs — new helper class that resolves the current process architecture (x86/x64/arm64) for both .NET Framework and .NET Core
• Modified CefRuntime.cs — replaced Environment.Is64BitProcess checks with ArchitectureHelper.ProcessArchitecture so ARM64 processes resolve the correct arch-specific assembly path
• Modified DependencyChecker.cs — skips d3dcompiler_47.dll in optional dependency checks when running on ARM64 (not available on that platform)
• Modified CefSharp.Core.Runtime.vcxproj and CefSharp.BrowserSubprocess.Core.vcxproj — added Debug|arm64 and Release|arm64 project configurations
• Modified CefSharp.BrowserSubprocess.csproj — added arm64 platform/runtime identifier and updated the post-build editbin/sn script to select the correct vcvarsall arch for x86, x64, and arm64 (including cross-compile from AMD64 host)
• Modified CefSharp3.sln — registered Debug|arm64 and Release|arm64 solution-level configurations for all projects
• Modified CefSharp.Native.props — added arm64 locale content item group
• Modified example and test projects (OffScreen, WinForms, WPF, HwndHost, Test) — added arm64 to , , and conditional / properties
• Modified CefSharp.Common.nuspec — added chromiumembeddedframework.runtime.win-arm64 dependency and arm64 binary entries
• Modified CefSharp.Common.props — added CefSharpCommonBinariesArm64 and CefSharpBrowserProcessCoreArm64 item groups
• Modified CefSharp.Common.targets — added arm64 / item groups and CefSharpCopyFilesAfterNugetRestoreArm64 copy target
• Modified build.ps1 — refactored BuildSolution to invoke msbuild.exe directly; added Get-HostArchitecture, Get-VCVarsAllArch, and Ensure-BuildEnvironment helpers to correctly bootstrap the VC environment per target arch (native or cross-compile); removed the blanket arm64 exclusion for NetFramework builds and replaced it with a guard that requires VS2022/v143 when targeting arm64

How Has This Been Tested?

Built the solution targeting ARM64 using build.ps1 with -BuildArches arm64 -Target vs2022 on an AMD64 host (cross-compile). Verified arm64 binaries are produced in bin\arm64\Release for both CefSharp.Core.Runtime and CefSharp.BrowserSubprocess.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Updated documentation

Checklist:

• Tested the code(if applicable)
• Commented my code
• Changed the documentation(if applicable)
• New files have a license disclaimer
• The formatting is consistent with the project (project supports .editorconfig)

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[AppVeyorBot]

❌ Build CefSharp 147.0.100-CI5487 failed (commit 14883d302f by @jamescharters)

[AppVeyorBot]

❌ Build CefSharp 147.0.100-CI5488 failed (commit da5271272b by @)

[jamescharters]

@amaitland Hi Alex, this is currently a draft of changes to get this building for ARM64. My team has compiled this locally and is using it on real ARM64 hardware (M4 Macs) without issue. Was wanting to know how to move forward with this, as it looks like the CI/CD environment does not support this architecture.

[AppVeyorBot]

❌ Build CefSharp 148.0.90-CI5510 failed (commit fd4a1df55e by @jamescharters)