QS4 file icon

QS4 File Extension

Sinclair QL Hires Screen Format

What is QS4 file?

QS4 filename suffix is mostly used for Sinclair QL Hires Screen Format files. Files with QS4 extension may be used by programs distributed for Windows platform. Files with QS4 extension are categorized as Raster Image Files files. The Raster Image Files subset comprises 505 various file formats. RECOIL is by far the most used program for working with QS4 files. RECOIL software was developed by Piotr Fusik and Adrian Matoga, and on its official website you may find more information about QS4 files or the RECOIL software program.

Programs which support QS4 file extension

Below is a table that list programs that support QS4 files. Files with QS4 suffix can be copied to any mobile device or system platform, but it may not be possible to open them properly on target system.

Programs that support QS4 file

Windows Windows

Updated: 07/04/2020

How to open file with QS4 extension?

There can be multiple causes why you have problems with opening QS4 files on given system. What is important, all common issues related to files with QS4 extension can be resolved by the users themselves. The process is quick and doesn’t involve an IT expert. The list below will guide you through the process of addressing the encountered problem.

Step 1. Install RECOIL software

Install software to open QS4 file The main and most frequent cause precluding users form opening QS4 files is that no program that can handle QS4 files is installed on user’s system. The solution to this problem is very simple. Download RECOIL and install it on your device. The full list of programs grouped by operating systems can be found above. One of the most risk-free method of downloading software is using links provided by official distributors. Visit RECOIL website and download the installer.

Step 2. Update RECOIL to the latest version

Update software that support file extension QS4You still cannot access QS4 files although RECOIL is installed on your system? Make sure that the software is up to date. Software developers may implement support for more modern file formats in updated versions of their products. This can be one of the causes why QS4 files are not compatible with RECOIL. The most recent version of RECOIL is backward compatible and can handle file formats supported by older versions of the software.

Step 3. Set the default application to open QS4 files to RECOIL

If you have the latest version of RECOIL installed and the problem persists, select it as the default program to be used to manage QS4 on your device. The next step should pose no problems. The procedure is straightforward and largely system-independent

Associate software with QS4 file on Windows

Selecting the first-choice application in Windows

  • Choose the Open with entry from the file menu accessed by right-mouse clicking on the QS4 file
  • Select Choose another app → More apps
  • To finalize the process, select Look for another app on this PC entry and using the file explorer select the RECOIL installation folder. Confirm by checking Always use this app to open QS4 files box and clicking OK button.
Associate software with QS4 file on Mac

Selecting the first-choice application in Mac OS

  • By clicking right mouse button on the selected QS4 file open the file menu and choose Information
  • Proceed to the Open with section. If its closed, click the title to access available options
  • Select RECOIL and click Change for all...
  • Finally, a This change will be applied to all files with QS4 extension message should pop-up. Click Continue button in order to confirm your choice.

Step 4. Ensure that the QS4 file is complete and free of errors

If you followed the instructions form the previous steps yet the issue is still not solved, you should verify the QS4 file in question. Problems with opening the file may arise due to various reasons.

Check QS4 file for viruses
1. The QS4 may be infected with malware – make sure to scan it with an antivirus tool.

Should it happed that the QS4 is infected with a virus, this may be that cause that prevents you from accessing it. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. If the QS4 file is indeed infected follow the instructions below.

2. Ensure the file with QS4 extension is complete and error-free

If you obtained the problematic QS4 file from a third party, ask them to supply you with another copy. The file might have been copied erroneously and the data lost integrity, which precludes from accessing the file. When downloading the file with QS4 extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Check if the user that you are logged as has administrative privileges.

Some files require elevated access rights to open them. Switch to an account that has required privileges and try opening the Sinclair QL Hires Screen Format file again.

4. Check whether your system can handle RECOIL

The operating systems may note enough free resources to run the application that support QS4 files. Close all running programs and try opening the QS4 file.

5. Check if you have the latest updates to the operating system and drivers

Latest versions of programs and drivers may help you solve problems with Sinclair QL Hires Screen Format files and ensure security of your device and operating system. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle QS4 files.

Do you want to help?

If you have additional information about the QS4 file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on QS4 file.

Top File Extensions
Show more
File Extension of the day
sav icon


Saved Game

SAV file format is used to store computer game progress data. This type of file contains information regarding state of the game such as in-game pr...