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March for The Arts Group

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Rodion Belousov
Rodion Belousov

How I Solved the "Unable to create steam appid.txt. mw3" Error with a Simple Script


What is steam appid.txt and why do you need it?




If you are a gamer who uses Steam, you might have encountered an error message that says "Unable to create steam appid.txt. mw3" when trying to launch a game. This error can be frustrating and prevent you from playing your favorite games. But what does it mean and how can you fix it?




Unable to create steam appid.txt. mw3



Steam appid.txt is a small text file that contains the appid of a game. The appid is a unique number that identifies a game on Steam. For example, the appid of Call of Duty: Modern Warfare 3 is 42690. Steam uses this file to check if the game is installed and registered on your account.


Sometimes, this file can be missing, corrupted, or overwritten by another game. This can cause Steam to fail to recognize the game and display the error message "Unable to create steam appid.txt. mw3". This means that Steam cannot create or access the steam appid.txt file for Modern Warfare 3.


Fortunately, there are some methods that can help you fix this error and play your game without any problems. In this article, we will show you how to fix the error "Unable to create steam appid.txt. mw3" using three different methods.


How to fix the error "Unable to create steam appid.txt. mw3"?




There are three possible methods that can help you fix the error "Unable to create steam appid.txt. mw3". You can try them one by one until you find the one that works for you.


Method 1: Restart Steam




The first and simplest method is to restart Steam. Sometimes, Steam can have some glitches or bugs that can cause errors like this. Restarting Steam can refresh its cache and settings and fix some minor issues.


To restart Steam, follow these steps:


  • Close any games or applications that are running on Steam.



  • Right-click on the Steam icon in your system tray and select Exit.



  • Wait for a few seconds and then launch Steam again.



  • Try launching Modern Warfare 3 and see if the error is gone.



If this method does not work, move on to the next one.


Method 2: Create or edit the steam appid.txt file manually




The second method is to create or edit the steam appid.txt file manually. This method requires you to know the appid of Modern Warfare 3 and locate its installation folder on your computer. You will also need a text editor like Notepad or WordPad.


How to find the appid of a game?




To find the appid of a game, you can use one of these methods:


  • Go to the Steam store page of the game and look at its URL. The appid is the number after "/app/". For example, for Modern Warfare 3, the URL is https://store.steampowered.com/app/42690/Call_of_Duty_Modern_Warfare_3/, so the appid is 42690.



  • Go to your Steam library and right-click on the game. Select Properties and then click on Local Files. Click on Browse Local Files and look at the address bar of the folder that opens. The appid is the number after "/steamapps/common/". For example, for Modern Warfare 3, the folder is C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Modern Warfare 3, so the appid is 42690.



  • Go to a website like https://steamdb.info/ and search for the name of the game. Click on the result that matches your game and look at its URL. The appid is the number after "/app/". For example, for Modern Warfare 3, the URL is https://steamdb.info/app/42690/, so the appid is 42690.



How to create or edit the steam appid.txt file?




To create or edit the steam appid.txt file, follow these steps:


  • Open your text editor and type in only the appid of Modern Warfare 3 (42690).



  • Save the file as steam_appid.txt (make sure it has no extension like .txt or .doc).



  • Copy or move the file to the installation folder of Modern Warfare 3 (the same folder where you see mw3.exe).



  • Try launching Modern Warfare 3 and see if the error is gone.



If this method does not work, move on to the next one.


Method 3: Use a script to launch a random game




The third method is to use a script to launch a random game from your Steam library. This method can bypass the need for a steam appid.txt file by using a different way of launching games on Steam. This method requires you to have some basic knowledge of scripting and use a Linux-based system or a Windows system with Bash installed.


How to write a script to launch a random game?




To write a script to launch a random game, follow these steps:


  • Open your text editor and type in this code:



  • ```bash #!/bin/bash cd /.steam/steamapps ls sort -R tail -1 while read file; do file=$file//[!0-9]/ steam -gameidlaunch $file done ``` This code will do the following:



  • Navigate to your Steam apps folder where all your installed games are located.



  • List all files in that folder and sort them randomly.



  • Select one file randomly from that list.



  • Extract only the numbers from that file name (which is the appid of that game).



  • Launch that game using Steam's command-line option "-gameidlaunch".



  • Save this file as random.sh (or any name you like with .sh extension).



  • Make this file executable by typing this command in your terminal:



```bash chmod +x random.sh ```


How to use this script to launch a random game?




To use this script to launch a random game, follow these steps:



  • Close any games or applications that are running on Steam.



  • Open your terminal and navigate to where you saved your script file (random.sh).



  • Type this command in your terminal:



  • ```bash ./random.sh ``` This will run your script and launch a random game from your Steam library.



  • If you are lucky, it might launch Modern Warfare 3 without any errors.




How to prevent the error "Unable to create steam appid.txt. mw3" in the future?




The error "Unable to create steam appid.txt. mw3" can be annoying and prevent you from playing your game smoothly. To avoid this error in the future, here are some tips that you can follow:


Keep Steam updated




Steam updates itself automatically by default, but sometimes it might fail and maps.


What is Steam?




Steam is a digital distribution platform for video games and software developed by Valve Corporation in 2003. It allows users to buy, download, install, update, and play games and software online. It also offers various features such as cloud saving, achievements, chat, voice chat, friends list, groups, workshops, and more.


What is a steam appid?




A steam appid is a unique number that identifies a game or software on Steam. It is used by Steam to check if the game or software is installed and registered on the user's account. It can also be used to launch the game or software using Steam's command-line options.


What is a steam appid.txt file?




A steam appid.txt file is a small text file that contains only the appid of a game or software. It is usually located in the installation folder of the game or software. It is used by Steam to check if the game or software is installed and registered on the user's account.


Why do I get the error "Unable to create steam appid.txt. mw3"?




You might get the error "Unable to create steam appid.txt. mw3" when trying to launch Modern Warfare 3 on Steam because of one of these reasons:



  • The steam appid.txt file for Modern Warfare 3 is missing, corrupted, or overwritten by another game.



  • Steam cannot access or create the steam appid.txt file for Modern Warfare 3 due to permission issues.



  • Steam has some glitches or bugs that prevent it from recognizing the game.



To fix this error, you can try one of the methods we have explained in this article.



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