Convert GSLIDES to PNG

Converting Google Slides Shortcuts directly to Portable Network Graphics (.gslides to .png conversion) is, per se, not possible, since the .gslides shortcuts do not contain any multimedia data. They merely link to an existing Google Slides object located on your Google Drive. 

Simply open your presentation using the .gslides shortcut, then download it in a .png format via the 'File -> Download As' function. The .gslides to .png conversion will generate a bitmap image.