Panther Folder (C:\$WINDOWS.~BT\Sources\Panther)

Bottom Line: It is 100% safe to delete the Panther folder. Deleting it will not affect your current Windows installation, application settings, or personal files.

What is the Panther Folder?

Located at C:\Windows\Panther or hidden inside C:\$WINDOWS.~BT\Sources\Panther, the Panther folder is created by the Windows Setup installer-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder)-folder) during major Windows updates or OS upgrades (e.g. upgrading from Windows 10 to Windows 11).

Panther stores:

• Setup Logs (setupact.log & setuperr.log): Detailed diagnostic logs recording every step of the installation.
• Compatibility Check Reports: Pre-installation hardware and app compatibility scan XMLs.

Once your Windows upgrade is complete and your system is running stable, these Panther log files are no longer needed.

Can You Delete the Panther Folder?

✅ Yes, it is completely safe to delete.

• No OS risk: Panther files are strictly historical installation logs.
• Frees space: Removing leftover upgrade logs frees 1 GB to 5 GB of space on your main system drive.

How to Safely Delete the Panther Folder

Method 1: Using Windows Disk Cleanup (Recommended)

1. Open Start, type Disk Cleanup, and press Enter.
2. Select C: drive and click Clean up system files.
3. Check Windows upgrade log files and Temporary Windows installation files.
4. Click OK > Delete Files.

Method 2: Manual Deletion via Command Prompt (Admin)

1. Open Start, search cmd, right-click Command Prompt, and select Run as administrator.
2. Run:

   rmdir /s /q C:\Windows\Panther

Related Guides

• Learn about deleting $WINDOWS.~BT folder.
• How to clean up Windows.old folder.
• Check if you can clean SoftwareDistribution Folder.