These files are the source artwork for the SideQuest application.
The files ending in afphoto were created in Affinity Photo and those ending in afdesign were created in Affinity Designer.
The NSIS installer images are based on the "NSIS3 Metro" artwork.
The 3D box is based on a design by DJ Vivid posted at https://skfb.ly/6LGDz under the CC Attribution license.
The SideQuest text is set in PT Sans, created by ParaType and licensed under the SIL Open Font License
Some artwork uses the DejaVu font family under a free license