---
slug: "アプリケーション\"Steam.app\"を開けません。のエラー"
title: "Error Opening the Application \"Steam.app\""
description: "\n\nIf you encounter the error \"Cannot open application 'Steam.app'\" when trying to launch the downloaded Steam on macOS 10.11 El Capitan, follow these steps. Note that the correctness of this method is not guaranteed..."
url: "https://www.ytyng.com/en/blog/アプリケーション\"Steam.app\"を開けません。のエラー"
publish_date: "2016-01-02T14:35:19Z"
created: "2016-01-02T14:35:19Z"
updated: "2026-02-26T23:44:38.178Z"
categories: ["mac"]
keywords: ""
featured_image_url: "https://media.ytyng.com/resize/20230812/664cbbd227b248e5948ca2419c3e2801.png.webp?width=768"
has_video: false
has_music: false
video_urls: []
music_urls: []
lang: "en"
---

# Error Opening the Application "Steam.app"

<div class="document">

<p>If you encounter the error "Cannot open application 'Steam.app'" when trying to launch the downloaded Steam on macOS 10.11 El Capitan, follow these steps. Note that the correctness of this method is not guaranteed...</p>
<ol class="arabic simple">
<li>Right-click on the Steam icon and select "Show Package Contents"</li>
<li>Navigate to Contents/MacOS</li>
<li>Locate steam.sh, then open Terminal and drag steam.sh into it. The full command should be:</li>
</ol>
<pre class="literal-block">$ /Applications/Steam.app/Contents/MacOS/steam.sh
</pre>
<p>It should look like this. Press Enter to execute.</p>
<ol class="arabic simple" start="4">
<li>Steam and Steam.app will be updated, and steam.sh will disappear.</li>
<li>Attempt to launch Steam.app again by double-clicking it. You will get a message saying it cannot be opened because it is damaged.</li>
<li>Use Terminal again. Drag Steam.app into Terminal to input the path, then move the cursor to the beginning of the command and enter xattr -rc.</li>
</ol>
<p>The full command should be:</p>
<pre class="literal-block">$ xattr -rc /Applications/Steam.app
</pre>
<p>It should look like this. Execute it.</p>
<ol class="arabic simple" start="7">
<li>Double-click Steam.app once more. It should now launch successfully.</li>
</ol>
</div>