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You received a .sketch file — the native format for Sketch, a UI/UX design tool that was the industry standard before Figma went cloud-first and ate its market share. Sketch files contain artboards, symbols, shared styles, and vector artwork for interface design, icon sets, and web layouts.
Sketch is macOS-only, which was always its strategic weakness. When Figma arrived with browser-based, cross-platform, real-time collaboration, many design teams migrated. Sketch responded with its own collaboration features, but the damage was done. Sketch files remain common in existing design systems, handoff documentation, and teams that prefer native Mac performance over browser-based tools.
Sketch (macOS, subscription or one-time purchase) opens .sketch natively. Figma can import Sketch files with good fidelity — it's a common migration path. Lunacy (free, Windows/macOS/Linux) opens and edits Sketch files without a Mac. For developers receiving Sketch files for implementation, Zeplin and Avocode provide design-to-code handoff without needing Sketch installed.