Planet Coaster Mac Crash Fix: Missing steam_appid.txt

Running Planet Coaster on an Apple Silicon Mac via Rosetta 2 crashed on launch. The root cause was not a Rosetta compatibility issue, but a missing steam_appid.txt in the game directory causing SteamAPI initialization to fail.

Crash Symptom

The game crashed immediately on launch. Crash report:

Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Code Type: X86-64 (Translated)
Triggered by Thread: 8 Main

The crash occurred during main-thread initialization, with Lua-related strings appearing in registers.

Environment Check

Item	Result
Binary type	x86_64 only (not Universal)
Rosetta 2	Installed
Game version	1.0.1 (Build 235765)
Publisher signature	Aspyr Media ✅
Build environment	Xcode 12.4, macOS 11.1 SDK (2021)
File integrity	All verified
Updates available	None

Conclusion: No native Apple Silicon version exists — Rosetta 2 is the only option.

Root Cause

Launching directly from the command line revealed the key error:

[S_API FAIL] SteamAPI_Init() failed; no appID found.
Either launch the game from Steam, or put the file steam_appid.txt
containing the correct appID in your game folder.

The game executable directory was missing steam_appid.txt, causing SteamAPI initialization to fail and triggering the crash.

Fix Steps

1. Create steam_appid.txt

echo "493340" > "/path/to/Planet Coaster.app/Contents/MacOS/steam_appid.txt"

493340 is Planet Coaster's Steam AppID.

2. Force Rosetta Launch via Command Line

arch -x86_64 "/path/to/Planet Coaster.app/Contents/MacOS/Planet Coaster"

Result

The game launched successfully. Logs showed:

[S_API] SteamAPI_Init(): Loaded 'steamclient.dylib' OK.
Setting breakpad minidump AppID = 493340
Pipeline persistent cache initialized
Received stats and achievements from Steam

All shader compilations passed, exit code 0 (clean exit).

Notes

• Planet Coaster 1's Mac port was done by Aspyr, built in 2021 — no native ARM version is planned
• Steam's "Verify Integrity of Game Files" does not restore a missing steam_appid.txt (it's not in the verification list)
• If launching directly from the Steam client still fails, add arch -x86_64 %command% to the game's Launch Options
• This fix applies to other Mac games that crash due to missing steam_appid.txt and SteamAPI init failure