QCOW2 File Extension
QEMU Copy-On-Write
- File Type qcow2
- Developer David T Reynolds
- Popularity
- Application Qemu Manager
- Category Virtual Machine Files
- Format Binary
What is a QCOW2 file?
Files with the QCOW2 extension are specifically tied to QEMU Copy-On-Write, a Virtual Machine Files type, and there are 56 files in this category.
The QEMU Copy-On-Write (QCOW2), created by David T Reynolds, is one of file format they developed, and they also built programs to support them.
QCOW2 files are compatible with various operating systems, including Windows and Linux. When working with QCOW2 files, you can rely on 2 programs, including Qemu Manager and QEMU.
How to open a QCOW2 file?
If you can’t open a QCOW2 file, it is usually because the necessary software is missing. To resolve the issue, select the right program from the list for your operating system. Then go to the official website of the developer, download the software, and install it.
Qemu Manager and QEMU are among the most widely used programs for handling QCOW2 files. To install the most up-to-date edition of Qemu Manager, visit the official David T Reynolds website. You can download the build that works across all operating systems.
After installing, your OS should instantly open QCOW2 files with Qemu Manager.
Setting Qemu Manager as default QCOW2 viewer
Change the default app for a file type in Mac
- Initiate a right click or use Control + left click on the desired QCOW2 file to open a menu where you can select various actions;
- Choose "Open in Application" and click "Other";
- Look towards the bottom of the window, where you will find the "Enable" menu. "Recommended programs" will be the default selection;
- Choose "All Programs" in this menu and search for Qemu Manager. Check the box next to "Always open in app" to set it as the default option.
Change default programs in Windows
- Take the first step by right-clicking on your QCOW2 file. Next, select "Open With" and then choose "Choose another app" from the available options;
- Choose Qemu Manager from the available applications listed in the pop-up window to set it as the default application to open your QCOW2 file;
- Be sure to check the "Always use this app" checkbox, and then click "OK" to confirm your selection.
Tips and tricks to solve problems with QCOW2 files
Problematic QCOW2 files can usually be resolved by making small changes in your software. See the tips below to help fix common issues.
Are there any techniques or tools available to repair a damaged QCOW2 file?
In a data recovery program, open the damaged QCOW2 file and select the "Repair" menu option. Wait for the recovery process to finish as it will automatically restore the damaged virtual machine files.
How do I know if my QCOW2 file has been damaged?
The signs of corrupted QCOW2 virtual machine files can manifest as:
- Error alerts occur when actions are performed on the file;
- The file shows slow performance when edited in Qemu Manager;
- The file encounters problems during the opening process or shows error indications;
- An unexplained increase in the size of the QCOW2 file;
- The file causes Qemu Manager or other software to hang or crash during various operations;
What factors contribute to Qemu Manager crash?
Lack of software updates is a possible reason behind Qemu Manager crash. Keep your David T Reynolds products up to date by installing the latest updates.
Restarting your computer is an essential troubleshooting step that can resolve many common problems. It is recommended to restart your computer before making any changes to the software settings.
How to edit a QCOW2 file?
To modify QCOW2 files, it is necessary to install dedicated software that lets you open and edit virtual machine files. Online QCOW2 editors generally offer fewer tools compared to programs designed for QEMU Copy-On-Write.
Best QCOW2 editors 2026
Based on the specified criteria, here is a list of QCOW2 editors that may fit your requirements.
| QCOW2 Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| QEMU | Fabrice Bellard | Linux | 4.8 out of 5 (42 reviews) |
| Qemu Manager | David T Reynolds | Windows | 4.3 out of 5 (40 reviews) |