Recommend if you are worried about the file's contents. How to Extract .7z.001 files - Microsoft Q&A
: A .7z.001 file is not a complete archive on its own; it requires all subsequent numbered parts (e.g., .7z.002 ) to be fully functional. Previews.7z.001
: Right-click the .7z.001 file and select "7-Zip" > "Extract Here" or "Extract files...". Recommend if you are worried about the file's contents
"Previews" in the context of .7z.001 often refers to viewing the file list without full extraction: Previews.7z.001
: The software (like 7-Zip or WinZip ) will automatically detect the other parts and combine them during extraction.
Troubleshoot (like "cannot open as archive").