The Walgreens security footage is in a format that does not display or play within web browsers.
To view the footage, download the Walgreens Security Player, which is the VG Player_EN.exe file, to a folder on your local PC.
Then download each of the four Walgreens files to the same folder.
Open the folder and run the VG Player executable. 
Use the File Open function within the player to select the VGZ file that you wish to view and select open.
The file will begin playing. 
The files and format are the same as introduced into evidence.