A .gui file is a ZIP package. The markup, design tokens, font declarations, binary assets, and a preview thumbnail all live in one self-contained file.

.gui package

Q: Is a .gui file just XML?

No — a .gui file is a ZIP package whose markup (design.guix) is XML, alongside a preview thumbnail and an assets/ folder. A raw XML string is also valid input; tools tell them apart by magic bytes (ZIP starts with PK, markup with <).

conceptfile format

A .gui file is a ZIP package. The markup, design tokens, font declarations, binary assets, and a preview thumbnail all live in one self-contained file.

Internally, the markup lives as design.guix — an implementation detail never surfaced to the outside. A program distinguishing a package from a raw markup string uses magic bytes: ZIP starts with PK, markup starts with <.

Attr	Type	Description
`design.guix`	`entry`	The UI markup — always this name inside the package.
`preview.webp`	`entry`	Thumbnail for visual verification before opening.
`assets/`	`entry`	Embedded WebP images and SVG vectors.

Package structure

checkout.gui  (ZIP)
├── design.guix
├── preview.webp
└── assets/
    ├── hero.webp
    └── icon-close.svg

Frequently asked

Is a .gui file just XML?

No — a .gui file is a ZIP package whose markup (design.guix) is XML, alongside a preview thumbnail and an assets/ folder. A raw XML string is also valid input; tools tell them apart by magic bytes (ZIP starts with PK, markup with <).