QNAP VS-2004L en - Manual (Page 99)

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Chapter 5. Play Video Files
The recording files on the NVR can be played by the web-based VioStor Player or QNAP
VioStor Player utility over LAN or WAN. The first time you connect to the playback
interface of the NVR by an IE browser, install the ActiveX plugin.
The VioStor Player utility can be installed from the product CD-ROM. Upon successful
installation, it is available on the Windows start menu > Programs > QNAP > VioStor
Player.