Modern Warfare 3 Unable To Create Steam Appidtxt

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How to Fix "Call of Duty: Modern Warfare 3 Unable to Create Steam Appid.txt" Error

If you are trying to install or play Call of Duty: Modern Warfare 3 on your PC, you may encounter an error message that says "Unable to create steam appid.txt". This error prevents the game from launching and can be frustrating for fans of the popular first-person shooter game. In this article, we will explain what causes this error and how to fix it.

What is Steam Appid.txt?

Steam Appid.txt is a text file that tells Steam what application or game is currently running. It is usually located in the game folder or in the Steam user data folder. The file contains a number that corresponds to the Application ID of the game. For example, the Application ID for Call of Duty: Modern Warfare 3 is 42690. You can find the Application ID for any game by following these steps:

Go to your Library

Right click the installed game and choose "Create desktop shortcut"

Go to your Desktop and locate the new shortcut

Right click on the shortcut and select Properties

Look at the target path for the number following steam://rungameid/. This number is the Application ID for the game.

What Causes the Error?

The error "Unable to create steam appid.txt" can be caused by various reasons, such as:

The file is missing, corrupted, or has the wrong number

The game is not installed properly or is incompatible with your system

Steam is not running or is outdated

The game is pirated or modified

How to Fix the Error?

Depending on the cause of the error, there are different solutions you can try to fix it. Here are some possible methods:

Verify the integrity of the game files. This will check if any files are missing or corrupted and will download them again. To do this, follow these steps:

Open Steam and go to your Library

Right click on Call of Duty: Modern Warfare 3 and select Properties

Go to the Local Files tab and click on Verify Integrity of Game Files

Wait for the process to finish and then launch the game

Create or edit the steam appid.txt file manually. This will ensure that the file has the correct number and is in the right location. To do this, follow these steps:

Open Notepad or any text editor

Type 42690 (the Application ID for Call of Duty: Modern Warfare 3) and save it as steam_appid.txt

Copy or move the file to the game folder (usually C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Modern Warfare 3) or to the Steam user data folder (usually C:\Program Files (x86)\Steam\userdata\\appdata\42690)

Launch the game from Steam or from the desktop shortcut

Restart Steam or update it to the latest version. This will ensure that Steam is running properly and can communicate with the game. To do this, follow these steps:

Close Steam completely by clicking on Steam > Exit in the menu bar

Relaunch Steam by double clicking on its icon or by running it as administrator

If there are any updates available, Steam will download them automatically. Wait for them to finish and then launch the game

Reinstall the game or use a different version. This will ensure that the game is compatible with your system and has no modifications that may cause errors. To do this, follow these steps:

Uninstall Call of Duty: Modern Warfare 3 from your PC by going to Control Panel 061ffe29dd