ODS-5_Syntax

   The extended (ODS-5) file name syntax offered by Extended File
   Specifications supports a larger character set and relaxes
   restrictions on lengths of file names and use of characters. This
   syntax allows Windows NT-style file names that use the following
   character set and naming conventions to be stored on and accessed
   by OpenVMS systems.
 

Additional information available:

Character_Set_Support           Special_Characters
Interpretation_of_Period