I am using windows cloud file API () to create some local placeholder files to represent the data from cloud. For most of the normal files, it works well that it can be hydrated automatically when users double click them. However, for some specific file types, users do not want them to be downloaded and they can only be viewed only.
So this is what I want to achieve:
- When the user double click this kind of placeholder file or right click to choose open in context menu, I need to skip the hydration of this file. Instead, I need to open web browser and go to a specific website.
- When the user right click this kind of placeholder files and choose "Always keep it in device", it needs to pop up the Not supported dialog saying this operation is not supported.
- When the user double click other files, they can be hydrated and opened by Windows OS.
It looks like the difficult part is how to differentiate the file opening and "Always keep it in device" as both of them requires the files to be hydrated first. I have tried to hook up CF_CALLBACK_TYPE_FETCH_DATA event of these placeholder files and returned Not Supported for this specific kind of file. But the result is not good as the "Not supported" error also showed up when I double click it.