.isk1 file: how to open it on Windows
1 Windows app registers the .isk1 extension. Install one of them to open the file with a double-click.
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A lightweight and easy-to-use application that runs silently in the background on your device without interrupting your regular work and protects your important files, emails, photos, and videos by backing them up securely to inSync Cloud.
Related guide: Change the default app for a file type in Windows