Windows naturally stores its crash reports in C:\ProgramData\Microsoft\Windows\WER\ . If the file is elsewhere, it might be a manual collection.
Attackers sometimes name malicious files after system components (like WER) to avoid detection. If you did not trigger a diagnostic report yourself, do not open the archive. You can verify suspicious files using the VirusTotal scanner. 7z file or how to read a Windows crash dump ? wer.7z
Snapshots of the program's memory at the time of the crash. If you did not trigger a diagnostic report
Details like the "Bucket ID," which helps developers group similar crashes together. Security Warning If you found this file unexpectedly: Snapshots of the program's memory at the time of the crash
When a Windows application crashes or hangs, the system can collect diagnostic information—such as memory dumps, error logs, and system details—and package them into a file. In some automated environments or third-party analysis tools, these reports are compressed into the .7z (7-Zip) format for easier storage or upload to technical support teams.