Fix, Download, and Update UserAgentSupport.js

Last Updated: 12/16/2023
[Time to Read: ~3-5 minutes]

JavaScript files such as UserAgentSupport.js utilize the JS file extension. This file is considered a Script (JavaScript) file, and was first created by Apple for the Apple QuickTime Player 7.7.9 software package.

The first release in the Windows 10 Operating System for UserAgentSupport.js was on 01/07/2016 inside Apple QuickTime Player 7.7.9. This file release marks the latest and most updated version from Apple.

This article discusses complete file details, JS file troubleshooting instructions for problems with UserAgentSupport.js, and a comprehensive set of free downloads for every file version that has been catalogued by our team.

File Analysis Provided by Jason Geater (Author)


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File Overview


General Information
File Name: UserAgentSupport.js
File Extension: JS file extension
File Type: Script
Description: JavaScript
User Popularity Rating:
 
Developer and Software Information
Software Program: Apple QuickTime Player 7.7.9
Developer: Apple
Software: Apple QuickTime Player
Software Version: 7.7.9
File Details
File Size (Bytes): 5536
Oldest File Date: 10/06/2019
Latest File Date: 10/06/2019


What are UserAgentSupport.js Error Messages?


General UserAgentSupport.js Runtime Errors

UserAgentSupport.js file errors often occur during the startup phase of Apple QuickTime Player, but can also occur while the program is running. These types JS errors are also known as “runtime errors” because they occur while Apple QuickTime Player is running. Here are some of the most common UserAgentSupport.js runtime errors:

Microsoft Visual C++ Runtime Library

Runtime Error!

Program: C:\Program Files (x86)\Common Files\Apple\Apple Application Support\WebKit.resources\inspector\UserAgentSupport.js

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.


Most JS errors are due to missing or corrupt files. Your UserAgentSupport.js file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Apple QuickTime Player), or deleted by a malware infection. Furthermore, UserAgentSupport.js file corruption could be caused from a power outage when loading Apple QuickTime Player, system crash while loading or saving UserAgentSupport.js, bad sectors on your storage media (usually your primary hard drive), or malware infection. Thus, it’s critical to make sure your anti-virus is kept up-to-date and scanning regularly.



How to Fix UserAgentSupport.js 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 UserAgentSupport.js 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 UserAgentSupport.js error, please proceed to the Step 2 below.

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

You can uninstall Apple QuickTime Player 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 Apple QuickTime Player 7.7.9 and click "Uninstall"
  5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Apple QuickTime Player software.

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

Apple QuickTime Player 7.7.9

Apple

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 UserAgentSupport.js 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 UserAgentSupport.js 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 UserAgentSupport.js 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 UserAgentSupport.js file version. We maintain a comprehensive database of 100% malware-free UserAgentSupport.js files for every applicable version of Apple QuickTime Player. 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 UserAgentSupport.js Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy this file to the appropriate Apple QuickTime Player folder location:
    Windows 10: C:\Program Files (x86)\Common Files\Apple\Apple Application Support\WebKit.resources\inspector\
  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 UserAgentSupport.js 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 UserAgentSupport.js Files (Malware-Tested 100% Clean)


CAUTION : We strongly advise against downloading and copying UserAgentSupport.js to your appropriate Windows system directory. Apple typically does not release Apple QuickTime Player JS 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 UserAgentSupport.js and all other JS files for Apple QuickTime Player. An incorrectly installed JS 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 UserAgentSupport.js


JS Files Related to UserAgentSupport.js

File Name Description Software Program (Version) File Size (bytes) File Location
SourceCSSTokenizer.js JavaScript Apple QuickTime Player 7.7.9 63203 C:\Program Files\WindowsApps\Microsoft.GetHelp_...
ScriptsSearchScope.js JavaScript Apple QuickTime Player 7.7.9 6405 C:\Users\Bill Gates\AppData\Local\Microsoft\Win...
HeapSnapshotWorker.js JavaScript Apple QuickTime Player 7.7.9 2030 C:\Program Files\WindowsApps\Microsoft.GetHelp_...
PACSupport.js JavaScript Apple QuickTime Player 7.7.9 9860 C:\Program Files\WindowsApps\Deleted\Microsoft....
HeapSnapshotProxy.js JavaScript Apple QuickTime Player 7.7.9 15233 C:\Program Files\WindowsApps\Microsoft.GetHelp_...

Other Files Related to UserAgentSupport.js

File Name Description Software Program (Version) File Size (bytes) File Location
CBS.log Log Apple Safari 5.1.7 904335 C:\Windows\Logs\CBS\
setupact.log Log Apple Safari 5.1.7 62521 C:\Windows\Panther\UnattendGC\
setupact.log Log Apple QuickTime Player 7.7.9 60976 C:\Windows\Panther\UnattendGC\
setupapi.dev.log Log Apple Safari 5.1.7 684126 C:\Windows\inf\
WmiApRpl.ini Windows Initialization Apple iTunes 12.10.1.4 29736 C:\Windows\inf\WmiApRpl\0009\


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