While 7z is better for compression, use the standard .zip format if you are sharing the files with someone who might not have 7-Zip installed.
If you're having trouble opening or creating this archive, let me know: Are you getting a ? Are you on Windows, macOS, or Linux ? Are you trying to compress or extract ? Does 7z compress better than zip? - Microsoft Community Hub
Right-click the HTEAT.7z file, select "7-Zip," and choose "Extract Here" or "Extract to [Folder Name]".