Open DSS File
DSS files have, three different types of uses, namely:
Olympus Recorders
DSS extension and format files are primarily used by Olympus DSS Player.
A DSS file typically contains an audio file that is generated through dictation or a voice recording captured by digital dictation recorders manufactured by Olympus.
Recording in DSS format is stored in the Digital Speech Standard file format (hence the acronym DSS) which is optimized for speech encoding.
Despite its high compression rate, the DSS format produces high-quality audio.
The reduced file size resulting from a highly compressed DSS file translates into lower bandwidth and storage requirements.
The DSS audio format is used in the police, medical, journalistic and academic sectors.
DiskStation Manager
For DiskStation Manager, a cloud-based operating system that ships with NAS-type network attached storage devices, DSS files are used to save your backup settings.
The settings saved in this file include domains, passwords, allowed file transfer protocols, user/group preferences, etc.
HEC-DSS
Another type of DSS file contains a database used by the HEC-DSS data storage system.
HEC-DSS means U.S. Army Corps of Engineers' Hydrologic Engineering Center Data Storage System, is basically a database system designed to efficiently store and retrieve scientific data that is usually sequential.
Data in DSS database files can be graphed, tabulated, edited and manipulated with HEC-DSSVue, a Java-based visual utilities program.
It is possible that you require some kind of permission to operate a software of this nature.