From the FLC information modeling group:

This is what the spec describes for this interface
"The SupportInfo Interface defines a number of additional data that a commonly exposed for Devices and their components. These include mainly images, documents, or protocol-specific data. The various types of information is organised into different folders. Each information element is represented by a read-only Variable. The information can be retrieved by reading the Variable value"

since OPc supports file objects, a version 2 of this interface should be created that provides the same information but via file object - that can be accessed using file transfer. the variable interface has all sorts of problems related to file sizes