Click on the menu at the top left, or look for an Import/Open icon (often shaped like a folder).
The most reliable way to play these files is through the software provided by your hardware manufacturer. For Annke Cameras: Search the Annke Support Center for their official desktop playback tool. For Enterprise Video: epv file player install
Given the variety of its uses, treat any unknown EPV file with the same caution as you would an executable file. These files can sometimes hide malware, so always scan them with trusted antivirus software before opening them. Cyber threats often use trusted-looking extensions to fool users, so just because the file looks familiar doesn't mean it's safe. Click on the menu at the top left,