3.3 Custom Attachment Storage

The storage format of Attachment objects that represent data from an arbitrary client application is controlled by the application itself. For example, a media application can write a completely different set of streams under the substorage than an image manipulation application.

The following figure shows the structure of the substorage for two different types of applications, demonstrating that the structure is essentially controlled by the owning application.

Expanded view of the substorage for two different types of applications

Figure 4: Expanded view of the substorage for two different types of applications

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