Associate the MONSTER file extension with the correct application.However, the information will not be displayed the same way as if you uploaded and opened the file with D&D 5e Statblock Generator. Since MONSTER files are saved in plain text format, you can also open them with a text editor by changing the. To create a MONSTER file with D&D 5e Statblock Generator, click Save Statblock, which will immediately begin the download of the MONSTER file to your computer. To upload and view a MONSTER file with D&D 5e Statblock Generator, click Load Statblock, and choose the MONSTER file you want to open. The files are meant to be opened in D&D 5e Statblock Generator. You will most likely only encounter MONSTER files if you enjoy playing D&D and use D&D 5e Statblock Generator to create and import monster information. MONSTER file open in Tetra-cube D&D 5e Statblock Generator MONSTER files include all the attributes for the monster, such as the name, size, type, speed, armor, strength, and abilities. It stores information in plain text in a JSON-like attribute-value format. A MONSTER file contains information about a monster created with D&D 5e Statblock Generator, a web program used to generate stats (statblocks) for monsters used in Dungeons & Dragons (D&D) play.