Implication #3: Files cannot be downloaded if Dropbox is running as a Windows Service Without Smart Sync - where Dropbox synchronizes all files to your hard drive - each document you see on your computer is readily available whether Dropbox is running or not. Note that this behavior only occurs when Smart Sync is on. Since files are fetched from the cloud as needed, you must be connected to the Internet to download files from .ĭropbox confirms this limitation in their FAQ as well: Implication #1: Files cannot be downloaded without an Internet connection Now that we understand how Smart Sync works, let’s highlight three implications of the technical architecture. The Minifilter and Dropbox.exe interact using Windows Interprocess Communication - a collection of technologies supporting communication between different programs. Windows makes the file available to the user.Dropbox.exe goes out to the Internet and downloads the file from.The Minifilter contacts the Dropbox.exe process and asks it to get the file.So when you request an “online-only” file not yet on your hard drive: The answer: Dropbox.exe - the process run when you launch Dropbox on your desktop. We don’t use system extensions to read or write filesĬlearly the Minifilter isn’t downloading the files from. We don’t use system extensions to parse any data in the filesystem We don’t use system extensions to make network requests However Dropbox says otherwise (the Minifilter is a “system extension”): Windows Interprocess Communication (IPC)Īt first, we thought that the Minifilter component did all the heavy lifting, downloading content as necessary. The next section examines how that works.ģ.
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