How to request OneDrive sync status for a given file

Question

Now that Microsoft has restored OneDrive to the file system in Windows 10 (and assuming that they will not give birth again after 6 months), I'm looking for how to determine the synchronization status for an arbitrary file.

There are at least five different states in the conductor (this is exactly what I observed, there may be others):

• Available online
• Available on this device
• Always available on this device.
• Sync / Download
• Mistake

The first two states for a file can be determined using the FILE_ATTRIBUTE_OFFLINE attribute.

It seems that the Always Available status can be defined for the file using the new undocumented file attribute 0x00080000 .

The definition of these states for folders, as well as synchronization and error states for files and folders, however, remains a mystery.

My first thought was to use a property system ( IPropertyStore ), but the following four property keys did not help:

• PKEY_OfflineAvailability returns VT_EMPTY
• PKEY_OfflineStatus returns VT_EMPTY
• PKEY_FilePlaceholderStatus returns an undocumented value (0xe), but it does not change when the status executes
• PKEY_FileOfflineAvailabilityStatus returns VT_EMPTY

I have a feeling that this will become just another undocumented Microsoft API, but I thought I'd ask to see if anyone had any suggestions.