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I have seen many sync clients such as Dropbox that can create "virtual" files that do not really exist on disk. They have a size and you can open them in any program, but they are streamed e.g. from the Dropbox servers.

I don't know how this is called, and I can't find any information about this on the internet. Do I have to write a file system driver for that, or is it possible to do this for example with the Windows API?

Twometer
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Dropbox is a file hosting service. (From WiKi)

On Windows you can use OneDrive to store files on Cloud.

Please refer to "Create file to Onedrive programmatically from C#?" for an sample.

Similar topic: "How to create a virtual file?"

Rita Han
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