The extension indicates a compressed archive created with 7-Zip, a free and open-source file archiver.
: If you use 7-Zip to open it, you can "Test" the archive or view its contents without fully extracting them to see what is inside. About 7z Files idisois.7z
: Use an updated antivirus or upload the file to VirusTotal to check it against multiple security engines. The extension indicates a compressed archive created with
: Only open archives from trusted websites or known senders. Malware often disguises itself as utility files or driver updates. idisois.7z