If you use with advanced settings (e.g., creating a Windows To Go drive or enabling Windows Store app preloading), Rufus may also create a wsappbak file. Is WSAPPBAK a Virus or Malware? No. The wsappbak file is not a virus, Trojan, or piece of malware .
During this process, some temporary or backup metadata related to Windows Store applications (modern UWP apps) may be stored in a file named wsappbak . It is not executable; it is generally a or a lightweight database file that the installer references when provisioning apps during the Windows installation.
Without wsappbak , Windows Setup proceeds normally but may download fresh copies of Store apps from the internet instead of staging them locally. For most users, this difference is unnoticeable. | File Name | Purpose | Safe to Delete? | |-----------|---------|-----------------| | wsappbak | Windows Store app backup (USB media) | Yes | | $WINDOWS.~BT | Temporary Windows Update/Upgrade files | Yes, after upgrade | | *.tmp | Generic temporary file | Usually yes | | pagefile.sys | Virtual memory paging file | No (on system drive) | | hiberfil.sys | Hibernation state file | Only if you disable hibernation | Final Verdict: Keep or Delete? Delete it without worry. wsappbak
The wsappbak file serves a minor helper function during Windows installation for preloading Store apps. It is never used after Windows is installed, and the original USB drive will work perfectly fine without it. It is not malware, not a critical system component, and not worth losing sleep over.
The file is not required for the proper functioning of Windows, your PC, or the bootable USB drive. Deleting it will not prevent you from using the USB drive as installation media—the core setup files remain intact. If you use with advanced settings (e
A: No. Typically smaller than 5 MB.
Either way, you can now confidently answer the question: — It’s nothing more than a harmless backup artifact from making a Windows USB drive. Frequently Asked Questions (FAQ) Q: I found wsappbak on my C: drive. Is that bad? A: It’s unusual. If you didn’t place it there, scan your system with Microsoft Defender. It could be a renamed file, but more likely it was copied accidentally. The wsappbak file is not a virus, Trojan,
A: No. It is never loaded into memory or executed.