How I Got R.E.P.O. Running on Mac Without Whisky

R.E.P.O. does not have a native Mac release. Its Steam page lists Windows 10 or 11, DirectX, and a discrete Windows GPU. That usually leaves Mac players choosing between a Windows PC, a paid compatibility product, or an old community guide whose tools may no longer be maintained.

I wanted a fourth option: use the Mac I already own, keep the real Steam client and Steam ownership checks, and build the setup entirely from free components I could inspect.

It works. The successful stack was Silo + Wine + DXMT on an Apple silicon Mac. The interesting part was not installing Steam—it was diagnosing why the game initially crashed with a DirectX 11 error and selecting the correct 64-bit graphics translation modules.

This guide documents the setup that worked for me on September 4, 2026. It is an independent compatibility experiment, not an official Mac port or a promise that every Mac, game update, or Silo release will behave identically.

The result

I tested the game on this machine:

• MacBook Pro with Apple M5 Pro
• 24 GB of unified memory
• macOS 27.0
• Silo 0.4.10, built locally from source
• Wine CX 26.3.0
• DXMT 0.72
• a legitimate Steam copy of R.E.P.O., app ID 3241660

R.E.P.O. launched through the real Windows Steam client. Steamworks loaded, Direct3D negotiated feature level 11.1, and the game remained running instead of exiting at graphics initialization.

That is narrower evidence than “R.E.P.O. supports Mac.” It proves this combination worked on one Apple silicon machine.

Why I did not use Docker

Docker is useful for Linux services and reproducible build environments. It is the wrong abstraction for this job on a Mac.

A Linux container on macOS runs inside a virtual machine. It does not give a Windows DirectX game the native Metal GPU path, desktop integration, audio, input, and Steam compatibility environment it needs. Making a game window appear from that stack would add virtualization and display layers without solving the DirectX-to-Metal problem.

The useful architecture is much simpler:

1. Wine provides the Windows userspace environment.
2. The real Windows Steam client runs inside the same Wine bottle as the game.
3. A graphics backend translates the game’s Direct3D calls to Metal.
4. Silo manages those pieces and remembers a backend choice per game.

Why Silo instead of Whisky

Whisky made Windows gaming on Apple silicon approachable, and many older tutorials still recommend it. Its repository was archived in May 2025, however, and its maintainers explicitly warn that it is no longer actively maintained and that games may break.

Silo is a newer open-source SwiftUI launcher built around the same practical goal. It runs a real Windows Steam client in a shared Wine bottle, imports Apple’s Game Porting Toolkit, installs DXMT, and can choose or override the Metal graphics backend for each game. Its Wine runtime is built from CodeWeavers’ published CrossOver sources, and its runtime downloads are checksum-verified.

Silo is still a young community project. The app is ad-hoc signed, not distributed through the Mac App Store, and is not App-Sandboxed because it must execute Wine and manage its bottle. Read its source and security notes before deciding whether that trust model works for you.

What you need

Before starting, have:

• an Apple silicon Mac
• a current version of macOS supported by Silo
• enough storage for Wine, Steam, translation runtimes, and the game
• a Steam account that owns R.E.P.O.
• a free Apple Developer account for the official Game Porting Toolkit download
• a backup of any existing Silo configuration you care about

The R.E.P.O. Steam page lists 8 GB of RAM and 1 GB of storage as its Windows minimums. Those are not Mac compatibility guarantees, and the complete Wine setup consumes more storage than the game alone.

Do not use this process to bypass Steam ownership, DRM, anti-cheat, or multiplayer restrictions. The reason this setup is useful is that the real Steam client and the game run together in the same bottle.

Install Silo

The easiest route is the current build on Silo’s Releases page. Because its downloaded app is ad-hoc signed, macOS may require Control-click → Open on first launch.

I preferred to build the exact source I was about to run. Silo requires a Swift 6 toolchain; Apple’s Command Line Tools are enough.

git clone https://github.com/mikaelhug/Silo.git
cd Silo
git checkout v0.4.10
./Scripts/test.sh
./Scripts/build-app.sh
ditto dist/Silo.app /Applications/Silo.app
open /Applications/Silo.app

The test script completed 525 tests across 71 suites before I installed the app. That count belongs to version 0.4.10 and will naturally change as the project evolves.

Building from source does not make third-party code automatically safe. It does make the exact revision and build process inspectable, which is the property I wanted.

Import Apple’s toolkit and set up Steam

Silo’s first-run flow asks for Apple’s Game Porting Toolkit, then downloads its Wine and DXMT runtimes and creates the shared Steam bottle.

For a clean installation:

1. Download the current Game Porting Toolkit from Apple.
2. In Silo, select the downloaded .dmg when prompted.
3. Let Silo download Wine and its graphics runtimes.
4. Complete both Microsoft Visual C++ redistributable installers when they appear.
5. Sign in to the real Windows Steam client that Silo opens.

I already had an Apple-signed GPTK 3 runtime installed through Heroic, so I reused a copy for the initial experiment. New users should follow Silo’s supported .dmg import instead of depending on another launcher’s private folder layout.

Apple describes GPTK as an evaluation and porting environment for running unmodified Windows executables on Apple silicon. Silo turns that lower-level capability into a game launcher, but neither Apple nor the R.E.P.O. developers officially support this specific setup.

Install R.E.P.O. in the Windows Steam client

Use Steam inside Silo exactly as you would on Windows:

1. Find R.E.P.O. in your library.
2. Install it and wait for Steam to finish downloading and validating the files.
3. Return to Silo and refresh its library if the game does not appear immediately.
4. Open the game’s settings in Silo and choose DXMT as its graphics backend.

Silo discovers installed games from Steam’s appmanifest_*.acf and libraryfolders.vdf files. Starting the install is not enough; the completed Steam manifest must exist before discovery can succeed.

The graphics failure I hit

My first launch used the automatic/GPTK path and failed before the game window initialized:

Failed to initialize graphics.
Make sure you have DirectX 11 installed, have up to date
drivers for your graphics card and have not disabled
3D acceleration in display settings.
InitializeEngineGraphics failed

The Wine crash log also contained a null page fault after loading dxgi and d3d11.

That message sounds like a missing Windows driver, but installing random DirectX redistributables would not address the actual boundary. On this Mac, the failure happened while Wine was selecting and loading the layer responsible for translating Direct3D 11 to Metal.

DXMT is specifically a Metal-based Direct3D 10 and 11 implementation for Wine. R.E.P.O. is a 64-bit Unity game, so it needed DXMT’s x86_64-windows modules. My Silo configuration pointed at the sibling i386-windows directory instead.

The fix: pin DXMT and verify the 64-bit path

First use Silo’s per-game settings to set R.E.P.O.’s graphics backend to DXMT. In current Silo releases, that should be the only manual change required.

If the same DirectX initialization error remains, fully quit both the game and Silo before inspecting the configuration:

silo_support="$HOME/Library/Application Support/Silo"
cp "$silo_support/config.json" "$silo_support/config.json.before-repo-dxmt"
open -e "$silo_support/config.json"

In the backend object, inspect dxmtLibDirPath. The final directory for this 64-bit game must be x86_64-windows/, not i386-windows/. The surrounding runtime version will depend on the Silo release you installed:

{
  "backend": {
    "dxmtLibDirPath": "file:///Users/you/Library/Application%20Support/Silo/Runtimes/dxmt-.../x86_64-windows/"
  }
}

Then find the game entry with "appID": 3241660 and verify that it contains:

{
  "appID": 3241660,
  "graphics": "dxmt"
}

Do not replace the rest of either object with these abbreviated examples. Preserve the existing keys, change only the incorrect path segment or graphics value, save valid JSON, and reopen Silo. The backup makes the manual edit reversible.

Silo then created a DXMT-specific Wine runtime variant and launched the game with the 64-bit wine64 executable.

How I verified that it was actually fixed

The absence of the error dialog was encouraging, but the game log provided stronger evidence. Silo keeps a log per Steam app ID. I checked R.E.P.O.’s with:

repo_log="$HOME/Library/Application Support/Silo/Logs/3241660.log"
grep -Ei 'feature level|winemetal|InitializeEngineGraphics|Unhandled page fault' "$repo_log"

The successful launch showed:

Maximum supported feature level: D3D_FEATURE_LEVEL_11_1
Using feature level D3D_FEATURE_LEVEL_11_1

The same run loaded steam_api64, stayed alive beyond startup, and did not contain the earlier graphics initialization failure or page fault. Together with the rendered game window, that was enough to call this setup working.

Troubleshooting notes

Silo does not show R.E.P.O.

Confirm that Steam finished the download, then refresh Silo’s library. Look for Steam’s manifest for app ID 3241660 if discovery still fails.

Steam opens with a blank or incomplete window

Quit Steam from Silo and reopen it. Silo launches Steam with compatibility flags for its Chromium-based interface; do not add unrelated Wine overrides until the standard launch has had a chance to finish first-run setup.

The DirectX 11 message returns

Confirm the game is pinned to DXMT and that dxmtLibDirPath ends in x86_64-windows/. Also check the newest game log; an old crash log can make a repaired setup look broken.

Voice chat cannot hear you

Allow microphone access for Silo when macOS asks. If the prompt was denied, review System Settings → Privacy & Security → Microphone and relaunch the game.

An update breaks the setup

Treat Silo, Wine, DXMT, Steam, macOS, and R.E.P.O. as separate moving parts. Record the versions that last worked, keep a copy of config.json, and inspect the newest per-game log before changing multiple layers at once.

What I would recommend now

For an Apple silicon owner who already owns the game and wants a free path, Silo is a more defensible starting point than following an old Whisky recipe. It is active, open source, uses the real Steam client, and exposes the graphics choice that made this repair possible.

It is not as polished or supported as buying a Windows PC or paying for a commercial compatibility product. Some games will fail because of anti-cheat, unsupported graphics behavior, launchers, or future updates. R.E.P.O. itself could change.

But this result is useful precisely because it is reproducible and diagnosable. The winning move was not pretending the game was native. It was giving each boundary a clear job—Steam for ownership, Wine for Windows behavior, DXMT for Direct3D 11, and Metal for the Mac GPU—then reading the log when one boundary selected the wrong architecture.

That is a much healthier foundation than keeping an archived wrapper alive indefinitely.

References

• Silo source, setup, architecture, and security notes
• DXMT source and documentation
• Apple Game Porting Toolkit
• R.E.P.O. on Steam
• Whisky maintenance notice

If you enjoy the engineering side of making Mac software easier to install, I also wrote about shipping macOS tools with a personal Homebrew tap.