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Highly Performant & Scalable Ultima Online Server Emulator https://www.modernuo.com
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Kamron Batman 326dc470de fix(ci): run test projects on CI and drop impossible LowerStatReq tests 
CI reported success despite two failing tests because the Test step ran
`dotnet test --no-restore`, but the Build step (BuildTool) only restores
and builds Application - never the test projects. Without a restore, the
test projects have no project.assets.json, so the Microsoft.NET.Test.Sdk
build targets aren't imported, the projects aren't recognized as test
projects, and `dotnet test` invokes the VSTest target against zero
projects: no output, exit 0. Failures were silently masked.

- Replace `--no-restore` with `dotnet test --logger trx --results-directory`
  on both the macOS and Linux jobs so the test projects restore and run.
- Add a guard that fails the job if no .trx is produced, as a permanent
  backstop against silent zero-test passes.

Also removes the two AosWeapon/AosArmor `EmitsLowerStatReqWhenPassed`
tests. PR #2501 deliberately emits LowerStatReq (1060435) inline in each
item, not in AosWeaponAttributes/AosArmorAttributes.GetProperties, which
no longer take a lowerStatReq argument. A prior "fix" dropped the argument
to make them compile but left the assertions expecting 1060435, so they
threw KeyNotFoundException at runtime. The "not emitted by GetProperties"
behavior stays covered by the sibling tests; the stale comments that
claimed lowerStatReq is passed in are removed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-02 22:14:03 -07:00
.config feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
.github fix(ci): run test projects on CI and drop impossible LowerStatReq tests 2026-07-02 22:14:03 -07:00
branding feat(build-tool): add application icon and refresh MUO.ico (#2487) 2026-06-14 11:59:54 -07:00
dev-docs feat(opl): OplTextBlock multi-line tooltip builder + AddChunked (#2507) 2026-07-02 19:41:36 -07:00
Distribution/Data refactor(spawners): replace DynamicJson with typed SpawnerDto records (#2505) 2026-06-25 23:24:45 -07:00
Projects fix(ci): run test projects on CI and drop impossible LowerStatReq tests 2026-07-02 22:14:03 -07:00
.cursorrules chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
.editorconfig chore(docs): Adds UnmanagedDataReader & BinaryFileReader documentation (#1968) 2024-10-01 17:07:51 -07:00
.gitattributes fix: Adds migration checks to CICD, updates dependencies, adds Fedora 37, alpine 3.17 support (#1309) 2022-12-22 12:12:47 -08:00
.gitignore feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
AGENTS.md chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
azure-pipelines.yml chore: Cleans workflows for NodeJS 24 (#2394) 2026-03-28 21:55:29 -07:00
CLAUDE.md feat(pathfinding): first-boot prompt to pre-bake the .swb map cache (#2475) 2026-06-07 16:30:33 -07:00
CODE_OF_CONDUCT.md Create CODE_OF_CONDUCT.md 2020-05-05 08:51:39 -07:00
CONTRIBUTING.md chore(license): Removes CLA requirement. All contributors moving forward will retain copyright. (#2038) 2024-12-31 02:52:58 -08:00
Directory.Build.props fix: Bumps dependencies. Adds Server 2012/2016 support. (#2509) 2026-07-02 19:29:34 -07:00
FAQ.md docs: Updates FAQ for time zone issues. (#1368) 2023-03-10 00:18:36 -08:00
GEMINI.md chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
global.json feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
LICENSE Fixes more line ending issues (#267) 2020-09-27 13:54:56 -07:00
ModernUO.slnx feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
publish.cmd feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00
publish.ps1 fix: Adds stamp check for build tool versioning (#2400) 2026-04-06 16:18:02 -06:00
publish.sh fix: Adds stamp check for build tool versioning (#2400) 2026-04-06 16:18:02 -06:00
README.md chore: Update README with Code Signing Policy (#2467) 2026-06-06 15:32:01 -07:00
rider-settings.zip Cleanup/Housekeeping (#242) 2020-09-12 15:31:21 -07:00
Rules.ruleset chore(docs): Adds UnmanagedDataReader & BinaryFileReader documentation (#1968) 2024-10-01 17:07:51 -07:00
SPONSORS.md chore: Updates readme files (#2247) 2025-07-27 11:04:32 -07:00
stylecop.json Updates formatting rules (#199) 2020-08-25 18:00:51 -07:00
THIRD-PARTY-NOTICES docs: Adds RunUO-Encryption notice attribution to DarkStorm (#2369) 2026-03-12 23:35:47 -07:00
version.json feat: Adds Build Tool for Publishing/Setup (#2392) 2026-03-28 21:21:50 -07:00

README.md

ModernUO - Ultima Online Server Emulator for the modern era!

ModernUO Discord Subreddit subscribers Twitter Follow

Ultima Online Server Emulator for the modern era!

GitHub license GitHub stars GitHub issues
GitHub build Azure Pipelines build

Requirements

Supported Operating Systems

Windows 10/11/2012/2016/2019/2022/2025 MacOS 14+ Debian 12+ Ubuntu 22+ LTS
Alpine 3.22+ Fedora 42+ RedHat 9+ CentOS Stream 9+ openSUSE 15.6+ SUSE Enterprise 15 SP6 Linux Mint 21+ Arch

Required Frameworks

All Operating Systems

.NET

Windows

VC++ Redistributable v14

Development

git .NET

Supported IDEs

Jetbrains Rider 2025.3+ space VSCode space Visual Studio 2026

Getting Started

  • Install prerequisite requirements
  • Clone this repository (or download the latest):
    • git clone https://github.com/modernuo/ModernUO.git
  • Open ModernUO.sln to start developing

Building/Publishing

Interactive Mode (Recommended for new users)

Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:

  • Check prerequisites (.NET SDK, native libraries)
  • Walk you through configuration and platform selection
  • Build and publish the server to the Distribution directory
  • Show deployment instructions for cross-compiled builds

Command Line

./publish.cmd [release|debug] [os] [arch]

Linux Prerequisites

Fedora, CentOS, RHEL, etc

dnf upgrade --refresh -y
# CentOS does not come with EPEL enabled
dnf install -y epel-release epel-next-release
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel

Ubuntu, Debian, etc

apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev

OSX Requirements

brew install icu4c libdeflate zstd argon2

Running the Server

  • Follow the publish instructions
  • The Distribution directory is portable — copy it to your production server for deployment
  • Run ModernUO.exe or dotnet ModernUO.dll from the Distribution directory
  • On first run, the server will prompt you to configure game data file locations

Troubleshooting / FAQ

Want to sponsor?

Thank you for supporting us! You can find out how by visiting the sponsors page.

Collaborators

Kamron Batman Mark1145

Thanks

  • RunUO Team & Community
  • Voxpire, the ServUO Team & Community
  • Karasho, Jaedan and the ClassicUO Community



Development Tools & Plugins provided with ♥ by

JetBrains
Material Theme

Code Signing Policy

Free code signing provided by SignPath.io, certificate by SignPath Foundation.

This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it

Teams & Roles

Approvers & Committers: Development Team