VBFixedString Attribute — Microsoft.VisualBasic.VBFixedStringAttribute
Defines a fixed-length string. It is the rough equivalent of the VB 6 declaration:
Dim s As String * length
It can be used to define fixed-length strings within structures, particularly structures that are to be passed to Win32 API functions, as well as to define fixed-length strings to be written to and read from random access files.