Here is the default location and how to access them. %SystemRoot%\Minidump

If your Windows 11 system has blue-screened (BSOD) or suddenly rebooted, crash dump files are your best friend for troubleshooting. These .dmp files contain a snapshot of system memory at the moment of the crash.

When expanded, this path is typically:

Where to Find Windows 11 Crash Dump Files (.dmp)