: If you don't want to install software, you can use browser-based tools like ezyZip to upload and extract the file. Common Issues Frequently Asked Questions (FAQ) - 7-Zip
Select to see the contents without extracting them. : If you don't want to install software,
: Get the software from the Official 7-Zip Website. Locate the File : Find your J1.7z file in Windows Explorer. Use the Context Menu : Windows 10 : Right-click the file and hover over 7-Zip . Locate the File : Find your J1
: Right-click, select Show more options , then hover over 7-Zip . Extract or Open : Extract or Open : : Install an app
: Install an app like iZip from the App Store or Google Play Store.
To open or "look into" a file with a extension, you need a file archiver that supports the 7z format. The most common and recommended tool for this is 7-Zip , which is free and open-source. How to Open a .7z File on Windows