Gets the size of the file, as decompressed outside the archive.
This property holds the decompressed size of the file. If an archive is open for read (i.e. has been scanned or decompressed), this information will be read from the archive headers. If an archive is not open for read, the component will retrieve the information for the corresponding value of DecompressedName from the local file system.
A value of -1 will be returned in case of an I/O error.
This property is read-only and not available at design time.