Games like The Darkest Files
Games like The Darkest Files include Return of the Obra Dinn, Sherlock Holmes: Crimes and Punishments, Murders on the Yangtze River, The Operator, and The Séance of Blake Manor. We matched them by the tags players give The Darkest Files on Steam (Adventure, Detective, Historical, Female Protagonist, and Puzzle): closest matches first, and among equally close ones the better-known games.

Return of the Obra Dinn
Shared: Detective · Puzzle · Atmospheric

Sherlock Holmes: Crimes and Punishments
Shared: Adventure · Detective · Puzzle

Murders on the Yangtze River
Shared: Detective · Adventure · Puzzle

The Operator
Shared: Detective · Puzzle · Atmospheric

The Séance of Blake Manor
Shared: Detective · Puzzle · Adventure

Strange Horticulture
Shared: Detective · Puzzle · Adventure

Sherlock Holmes: The Devil's Daughter
Shared: Adventure · Detective · Puzzle

Call of the Sea
Shared: Adventure · Puzzle · Female Protagonist

Blue Prince
Shared: Puzzle · Adventure · Investigation

What Remains of Edith Finch
Shared: Adventure · Atmospheric · Female Protagonist

Chants of Sennaar
Shared: Adventure · Puzzle · Detective

Contrast
Shared: Adventure · Female Protagonist · Puzzle

L.A. Noire
Shared: Detective · Adventure · Noir

The Painscreek Killings
Shared: Detective · Puzzle · Investigation

Cyber Manhunt
Shared: Simulation · Puzzle · Detective

The House of Da Vinci
Shared: Puzzle · Adventure · Atmospheric

Syberia: The World Before
Shared: Adventure · Puzzle · Female Protagonist

The Rise of the Golden Idol
Shared: Detective · Adventure · Puzzle

Orwell: Keeping an Eye On You
Shared: Simulation · Detective · Political Sim

The Rewinder
Shared: Adventure · Detective · Puzzle

GRIS
Shared: Adventure · Female Protagonist · Atmospheric

A Plague Tale: Innocence
Shared: Adventure · Female Protagonist · Atmospheric

Strange Antiquities
Shared: Detective · Puzzle · Adventure

Outer Wilds
Shared: Adventure · Puzzle · Atmospheric