How to Download, Fix, and Update Steam_1003.mst

Last Updated: 12/15/2023
[Average Article Time to Read: 4.7 minutes]

Microsoft Windows Installer Transform files such as Steam_1003.mst utilize the MST file extension. This file is considered a Executable Application (Microsoft Windows Installer Transform) file, and was first created by Valve for the Steam API v018 software package.

The first version of Steam_1003.mst for Steam API v018 was seen on 11/05/2014 in Windows 10. This file marks the latest update from Valve, according to our records.

Continue reading below to discover detailed file information, MST file troubleshooting, and free downloads of several versions of Steam_1003.mst.

File Analysis Provided by Jason Geater (Author)


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File Overview


General Information
File Name: Steam_1003.mst
File Extension: MST file extension
File Type: Executable Application
Description: Microsoft Windows Installer Transform
User Popularity Rating:
 
Developer and Software Information
Software Program: Steam API v018
Developer: Valve
Software: Steam
Software Version: API v018
File Details
File Size (Bytes): 32
Oldest File Date: 12/29/2019
Latest File Date: 12/29/2019


What are Steam_1003.mst Error Messages?


Steam_1003.mst Runtime Errors

Runtime errors are Steam errors that occur during "runtime". Runtime is pretty self-explanatory; it means that these MST errors are triggered when Steam_1003.mst is attempted to be loaded either when Steam is starting up, or in some cases already running. Runtime errors are the most common form of MST error you will encounter using Steam.

In most cases, Steam_1003.mst runtime errors occurring while the program is running will result in the program terminating abnormally. Most of these Steam_1003.mst error messages mean that Steam was either unable to locate this file on startup, or the file is corrupt, resulting in a prematurely-aborted startup process. Generally, Steam will be unable to start without resolving these errors.

Some of the most common Steam_1003.mst errors include:

  • Steam_1003.mst - Bad Image.
  • Steam_1003.mst Application Error.
  • Steam_1003.mst could not be found.
  • Steam_1003.mst could not be installed.
  • Steam_1003.mst could not be launched. Class not registered.
  • Steam_1003.mst could not be started.
  • Steam_1003.mst failed to initialize properly.
  • Steam_1003.mst has encountered a problem and needs to close. We are sorry for the inconvenience.
  • Steam_1003.mst is not a valid Win32 application.
  • Steam_1003.mst is not running.
  • Cannot find Steam_1003.mst.
  • Error starting program: Steam_1003.mst.
  • Faulting Application Path: Steam_1003.mst.
  • The file Steam_1003.mst is missing or corrupt.
  • Windows failed to start - Steam_1003.mst.
System Error


The program can’t start because Steam_1003.mst is missing from your computer. Try reinstalling the program to fix this problem.

Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

Finding the source of the Steam_1003.mst error is key to properly resolving these errors. Although most of these MST errors affecting Steam_1003.mst will happen during startup, occasionally you will encounter a runtime error while using Steam API v018. This can occur due to poor programming on behalf of Valve, conflicts with other software or 3rd-party plug-ins, or caused by damaged and outdated hardware. Also, these types of Steam_1003.mst errors can occur if it has been accidentally moved, deleted, or corrupted by a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.



How to Fix Steam_1003.mst Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your Steam_1003.mst issue. These troubleshooting steps are listed in the recommended order of execution.


Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. When you see the search box, type "System Restore" and press "ENTER".
  3. In the search results, find and click System Restore.
  4. Please enter the administrator password (if applicable / prompted).
  5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
  6. Restore your computer to that backup image.

If the Step 1 fails to resolve the Steam_1003.mst error, please proceed to the Step 2 below.

Step 2: If recently installed Steam (or related software), uninstall then try reinstalling Steam software.

You can uninstall Steam software by following these instructions (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "Uninstall" and press "ENTER".
  3. In the search results, find and click "Add or Remove Programs"
  4. Find the entry for Steam API v018 and click "Uninstall"
  5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Steam software.

If this Step 2 fails as well, please proceed to the Step 3 below.

Steam API v018

Valve

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many Steam_1003.mst error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

  1. Hit the Windows Start button
  2. In the search box, type "Update" and press "ENTER".
  3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
  4. If updates are available for download, click "Install Updates".
  5. After the update is completed, restart your PC.

If Windows Update failed to resolve the Steam_1003.mst error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.



If Those Steps Fail: Download and Replace Your Steam_1003.mst File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate Steam_1003.mst file version. We maintain a comprehensive database of 100% malware-free Steam_1003.mst files for every applicable version of Steam. Please follow the steps below to download and properly replace you file:

  1. Locate your Windows operating system version in the list of below "Download Steam_1003.mst Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy this file to the appropriate Steam folder location:
    Windows 10: C:\Program Files (x86)\Steam\
  4. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.


GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve Steam_1003.mst problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.



Download Steam_1003.mst Files (Malware-Tested 100% Clean)


CAUTION : We strongly advise against downloading and copying Steam_1003.mst to your appropriate Windows system directory. Valve typically does not release Steam MST files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing Steam_1003.mst and all other MST files for Steam. An incorrectly installed MST file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10


Files Related to Steam_1003.mst


MST Files Related to Steam_1003.mst

File Name Description Software Program (Version) File Size (bytes) File Location
Steam_1003.mst Microsoft Windows Installer Transform Steam API v018 32 C:\Windows\Prefetch\

Other Files Related to Steam_1003.mst

File Name Description Software Program (Version) File Size (bytes) File Location
setupact.log Log Steam API v018 27977 C:\Windows\System32\Sysprep\Panther\
api-ms-win-core-heap-l... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 11112 C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
api-ms-win-core-heap-l... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.18362.1) 11728 C:\Program Files (x86)\Steam\bin\cef\cef.win7x64\
diagwrn.xml Extensible Markup Language Steam API v018 5718 C:\Windows\System32\Sysprep\Panther\
diagerr.xml Extensible Markup Language Steam API v018 5718 C:\Windows\System32\Sysprep\Panther\


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