How to Fix SteamAPI_RestartAppIfNecessary() Error When Launching Games
Some Steam users may encounter an error message that says \"SteamAPI_RestartAppIfNecessary() has been triggered. Aborting startup\" when they try to launch certain games from their library or from the game's executable file. This error indicates that the game cannot communicate with the Steam client properly and needs to restart. However, restarting the game or Steam may not always solve the problem. In this article, we will show you some possible solutions to fix this error and enjoy your games without interruption.
What Causes SteamAPI_RestartAppIfNecessary() Error
There are several possible reasons why you may see this error when launching a game on Steam. Some of them are:
The game's executable file is missing or corrupted.
The game's app ID is incorrect or mismatched with the Steam client.
The game's launcher is interfering with the Steam client.
The game's files are outdated or incompatible with the Steam client.
The Steam client is not running or logged in.
The Steam client is blocked by firewall or antivirus software.
How to Fix SteamAPI_RestartAppIfNecessary() Error
Depending on the cause of the error, you may need to try different solutions to fix it. Here are some common methods that may help you resolve this issue:
Verify the integrity of the game's files. This will check if any of the game's files are missing or corrupted and replace them with the correct ones. To do this, follow these steps:
Open Steam and go to your library.
Right-click on the game that is giving you the error and select Properties.
Go to the Local Files tab and click on Verify Integrity of Game Files.
Wait for the process to complete and then launch the game again.
Check the game's app ID and make sure it matches with the Steam client. The app ID is a unique number that identifies each game on Steam. You can find it by searching for the game on SteamDB. To check if the app ID is correct, follow these steps:
Open the game's installation folder. You can find it by right-clicking on the game in your library, selecting Properties, going to the Local Files tab and clicking on Browse Local Files.
Look for a file named steam_appid.txt and open it with a text editor.
Compare the number in the file with the app ID on SteamDB. If they are different, change the number in the file to match the one on SteamDB and save it.
Launch the game again and see if the error is gone.
Rename or delete the game's launcher. Some games have their own launchers that may conflict with the Steam client and cause the error. To fix this, you can try renaming or deleting the launcher file and run the game directly from its executable file. To do this, follow these steps:
Open the game's installation folder as described in step 2.
Look for a file named Launcher.exe or something similar and rename it to something else or delete it.
Find the game's executable file, usually named after the game itself, such as AoK HD.exe or AoE2DE_s.exe, and double-click on it to run it.
If you get a login window for Steam, enter your credentials and launch the game.
Update your Steam client and your game. Sometimes, outdated or incompatible versions of Steam or your game may cause the error. To fix this, you can try updating both of them to their latest versions. To do this, follow these steps: