Apple has had an iCloud app for Windows 10 for a while now, but the link to download it was always buried deep in Apple’s support pages. Thanks to a rare joint-effort from Apple and Microsoft, though, now you can find a free and improved official Apple iCloud app in the Windows Store itself.
It largely looks and works like the old app, but this version shares the same technology behind Files On-Demand for Microsoft’s own OneDrive service. As a result, you can open and work on your iCloud files through the app without having to download them to the PC, as iCloud Drive will keep the changes in sync. In most scenarios, that should save both your time and disk space.