File Extension Database

Open SYS File

SYS file extension is widely used on MS-DOS and Windows platforms by SYStem files. Usually these files contain executable code for hardware device drivers (for example 1394bus.sys). Windows Operating System opens SYS files and runs them in the kernel-mode which is the highest possible privilege on Microsoft Windows systems. This means that errors in SYS files can cause great harm and data loss. If these files are infected by viruses, trojans or rootkits infection may be very hard to remove. We strongly recommend to install drivers only from trusted sources like official hardware manufacturer websites or digital media that came with the device.

Two other notable SYS files are config.sys and msdos.sys. These files are different from the ones that are described above because they contain configuration parameters in text form rather than executable code. These files were widely used in MS-DOS days along with autoexec.bat file to control the way system boots up. However these files are obsolete on modern Windows systems and are available for backward compatibility purposes only.

Frequently associated Windows objects:

sysfile

How Can I Open SYS File on Windows

We researched and learned that the best way to open SYS file is to find a SYS file in question in Windows OS File Explorer and double click on it to launch the corresponding application.
If a SYS file is not opened in an application and you instead get a "Windows can't open a file" error message you should try looking for an application which can open the file in question.
If you know the application which can open SYS file then run it and see if there is a File->Open main menu option in the application.
If you don't know the application which function as SYS file opener then try to search online for "SYS viewer", "application to open SYS file" or "open SYS file" queries in the search engine you like.
Install the application you found and check if it can open SYS file

How Can I Open SYS File on Mac OS

We recommend to find a SYS file in question in Mac OS Finder and double click on it to launch the corresponding application.
If a SYS file is not opened in a Mac OS application and you instead get a "There is no application set to open the file" error message you can click on "Search App Store" in the error dialog and Mac OS will show you applications compatible with SYS file.
If you know the Mac OS application which can work as SYS file opener you can choose the "Choose Application..." option in the error box to associate the file extension and open SYS file in it.
If you don't know the application which can open SYS file then try to search for "SYS viewer", "application to open SYS file" or "read SYS file" queries in the online search engine you like.
Install the application you found and check if it can read SYS file

How Can I Open SYS File on Android

If you downloaded a SYS file on Android device you can open it by following steps below:

In the Android apps list on your Android device find "My Files" or "File manager" app and tap to start it.
Tap on "Downloads" folder inside the app.
You should see your downloaded SYS file in that folder.
Tap on the file. If Android device supports opening the file you downloaded it will open in the corresponding app.
If file does not open you can look for the corresponding app that can open the file by searching Android App Store for the "SYS".
If you cannot open the file with the apps from Android App Store it is possible that the file could only be opened on desktop platforms such as Windows or Mac OS. Try searching for "SYS viewer", "SYS file reader" online and see if any desktop applications can open it.
It is also possible that the file you downloaded is outdated and is no longer supported.

How to Open SYS File on iPhone or iPad

To open SYS File on iOS device follow steps below:

We advies to open Files app on your iPhone or iPad device. You can find it by swiping down on the home screen and typing "Files" in the search bar.
Tap on the Downloads folder on the Files app home screen.
You will see all files that you recently downloaded. Tap on the SYS file to view it.
If you have the right app that can open it it will automatically launch and open your file.
If you don't have the app which can open it you need to serch Apple app store for "SYS". This way you can find apps which can open SYS files.
If this doesn't help it is possible that your file could be opened only by the desktop application. To find an app which can open it on desktop look for "SYS viewer" or "SYS file" online in your favorite search engine.