diff --git a/manifests/l/Lonestill/OnyxLauncher/1.6.3/Lonestill.OnyxLauncher.installer.yaml b/manifests/l/Lonestill/OnyxLauncher/1.6.3/Lonestill.OnyxLauncher.installer.yaml
new file mode 100644
index 0000000000000..70810058653de
--- /dev/null
+++ b/manifests/l/Lonestill/OnyxLauncher/1.6.3/Lonestill.OnyxLauncher.installer.yaml
@@ -0,0 +1,24 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.installer.1.12.0.schema.json
+
+PackageIdentifier: Lonestill.OnyxLauncher
+PackageVersion: 1.6.3
+InstallerLocale: en-US
+InstallerType: nullsoft
+Scope: user
+InstallModes:
+- interactive
+- silent
+UpgradeBehavior: install
+ProductCode: 8b88b68d-6b91-5b48-be7e-9f0fb12fc8b3
+AppsAndFeaturesEntries:
+- DisplayName: Onyx Launcher *
+  ProductCode: 8b88b68d-6b91-5b48-be7e-9f0fb12fc8b3
+InstallationMetadata:
+  DefaultInstallLocation: '%LocalAppData%\Programs\Onyx Launcher'
+Installers:
+- Architecture: x64
+  InstallerUrl: https://github.com/lonestill/onyx-launcher/releases/download/v1.6.3/Onyx.Launcher.Setup.1.6.3.exe
+  InstallerSha256: 5ADB1DE515AA89AF876406C17117CE79C85F245F046F8D5671F40F643E614250
+ManifestType: installer
+ManifestVersion: 1.12.0
+ReleaseDate: 2026-07-30
diff --git a/manifests/l/Lonestill/OnyxLauncher/1.6.3/Lonestill.OnyxLauncher.locale.en-US.yaml b/manifests/l/Lonestill/OnyxLauncher/1.6.3/Lonestill.OnyxLauncher.locale.en-US.yaml
new file mode 100644
index 0000000000000..c47a7a3a7bd07
--- /dev/null
+++ b/manifests/l/Lonestill/OnyxLauncher/1.6.3/Lonestill.OnyxLauncher.locale.en-US.yaml
@@ -0,0 +1,29 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.defaultLocale.1.12.0.schema.json
+
+PackageIdentifier: Lonestill.OnyxLauncher
+PackageVersion: 1.6.3
+PackageLocale: en-US
+Publisher: Onyx Launcher contributors
+PublisherUrl: https://github.com/lonestill/onyx-launcher
+PublisherSupportUrl: https://github.com/lonestill/onyx-launcher/issues
+Author: Onyx Launcher contributors
+PackageName: Onyx Launcher
+PackageUrl: https://github.com/lonestill/onyx-launcher
+License: MIT
+LicenseUrl: https://github.com/lonestill/onyx-launcher/blob/master/LICENSE
+Copyright: Copyright (c) 2026 Onyx Launcher contributors
+ShortDescription: Open-source Minecraft launcher for isolated instances, Modrinth content, automatic Java, diagnostics, and safe backups.
+Description: Onyx Launcher is a modern Minecraft launcher for Windows and Linux. It manages isolated game instances, Vanilla and popular mod loaders, Modrinth modpacks and mods, automatic Eclipse Temurin runtimes, crash diagnostics, world snapshots, backups, and per-instance performance settings.
+Moniker: onyx-launcher
+Tags:
+- fabric
+- forge
+- game-launcher
+- minecraft
+- minecraft-launcher
+- modrinth
+- neoforge
+- quilt
+ReleaseNotesUrl: https://github.com/lonestill/onyx-launcher/releases/tag/v1.6.3
+ManifestType: defaultLocale
+ManifestVersion: 1.12.0
diff --git a/manifests/l/Lonestill/OnyxLauncher/1.6.3/Lonestill.OnyxLauncher.yaml b/manifests/l/Lonestill/OnyxLauncher/1.6.3/Lonestill.OnyxLauncher.yaml
new file mode 100644
index 0000000000000..9101ad5ed65cf
--- /dev/null
+++ b/manifests/l/Lonestill/OnyxLauncher/1.6.3/Lonestill.OnyxLauncher.yaml
@@ -0,0 +1,7 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.version.1.12.0.schema.json
+
+PackageIdentifier: Lonestill.OnyxLauncher
+PackageVersion: 1.6.3
+DefaultLocale: en-US
+ManifestType: version
+ManifestVersion: 1.12.0