QCOW File Extension

What is QCOW file?

QCOW is a file extension commonly associated with QEMU Copy-On-Write files. QEMU Copy-On-Write format was developed by David T Reynolds. QCOW file format is compatible with software that can be installed on Linux, Windows system platform. QCOW file format, along with 6033 other file formats, belongs to the Misc Files category. Users are advised to use Qemu Manager software for managing QCOW files, although 1 other programs can also handle this type of file. On the official website of David T Reynolds developer not only will you find detailed information about theQemu Manager software, but also about QCOW and other supported file formats.

Programs which support QCOW file extension

The list that follows enumerates programs compatible with QCOW files, divided into 2 categories based on operating system on which they are available. QCOW files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

How to open file with QCOW extension?

Being unable to open files with QCOW extension can be have various origins. Fortunately, most common problems with QCOW files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. We have prepared a listing of which will help you resolve your problems with QCOW files.

Step 1. Install Qemu Manager software

Problems with opening and working with QCOW files are most probably having to do with no proper software compatible with QCOW files being present on your machine. The most obvious solution is to download and install Qemu Manager or one to the listed programs: QEMU. 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 Qemu Manager website and download the installer.

Step 2. Check the version of Qemu Manager and update if needed

If you already have Qemu Manager installed on your systems and QCOW files are still not opened properly, check if you have the latest version of the software. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. If you have an older version of Qemu Manager installed, it may not support QCOW format. The latest version of Qemu Manager should support all file formats that where compatible with older versions of the software.

Step 3. Set the default application to open QCOW files to Qemu Manager

After installing Qemu Manager (the most recent version) make sure that it is set as the default application to open QCOW files. The method is quite simple and varies little across operating systems.

Change the default application in Windows

• Right-click the QCOW file and choose Open with option
• Next, select the Choose another app option and then using More apps open the list of available applications
• Finally select Look for another app on this PC, point to the folder where Qemu Manager is installed, check the Always use this app to open QCOW files box and conform your selection by clicking OK button

Change the default application in Mac OS

• Right-click the QCOW file and select Information
• Open the Open with section by clicking its name
• Select the appropriate software and save your settings by clicking Change all
• A message window should appear informing that This change will be applied to all files with QCOW extension. By clicking Continue you confirm your selection.

Step 4. Verify that the QCOW is not faulty

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper QCOW file. Being unable to access the file can be related to various issues.

1. Check the QCOW file for viruses or malware

If the file is infected, the malware that resides in the QCOW file hinders attempts to open it. It is advised to scan the system for viruses and malware as soon as possible or use an online antivirus scanner. If the scanner detected that the QCOW file is unsafe, proceed as instructed by the antivirus program to neutralize the threat.

2. Check whether the file is corrupted or damaged

If you obtained the problematic QCOW file from a third party, ask them to supply you with another copy. During the copy process of the file errors may occurred rendering the file incomplete or corrupted. This could be the source of encountered problems with the file. When downloading the file with QCOW extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Verify whether your account has administrative rights

Sometimes in order to access files user need to have administrative privileges. Switch to an account that has required privileges and try opening the QEMU Copy-On-Write file again.

4. Make sure that the system has sufficient resources to run Qemu Manager

If the systems has insufficient resources to open QCOW files, try closing all currently running applications and try again.

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

Regularly updated system, drivers, and programs keep your computer secure. This may also prevent problems with QEMU Copy-On-Write files. It is possible that one of the available system or driver updates may solve the problems with QCOW files affecting older versions of given software.

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