Occurs when downloading of a single file in the file list has started.
The ID of the file which has started
downloading. The file ID is a value returned from the AddFile
method when the file was added to the file list.
The file size (in bytes). If the file size is
not known, the fileSize is "-1". Even though the
fileSize is of String type (to support large file sizes - up to 263
always contains integer values specifying the
file size in bytes.
The number of file segments the file is
split into during the download. The segmentCount value may be different
than the one specified with the AddFile
method, depending on the actual file size and the MinFileSegmentSize