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+---
+epic: 8
+story: 8.6
+title: "File Management"
+status: draft
+---
+
+## Epic 8 — Windows App (Rust + iced)
+**Goal:** Fast, lightweight native Windows app -- single .exe, no runtime dependencies.
+
+### Story 8.6: File Management
+
+As a **Windows user**,
+I want my sheets stored as files in a standard location with a sidebar for navigation,
+So that I can organize my calculations and find them through Windows Search.
+
+**Acceptance Criteria:**
+
+**Given** the app is installed
+**When** the user creates a new sheet
+**Then** it is saved as a `.calcpad` JSON file in `%APPDATA%\CalcPad\sheets\`
+
+**Given** sheets exist in the storage directory
+**When** the app's sidebar is displayed
+**Then** all sheets and folders appear in a tree view matching the directory structure
+
+**Given** the sidebar shows sheets and folders
+**When** the user clicks a sheet name
+**Then** the editor loads that sheet's content
+
+**Given** sheets are stored as `.calcpad` files
+**When** Windows Search indexes the directory
+**Then** sheets are discoverable by file name and (if a search protocol handler is registered) by content
+
+**Given** the user renames a sheet via the sidebar
+**When** the rename is confirmed
+**Then** the underlying file is renamed on disk and the sidebar updates
+
+**Given** the user creates a folder via the sidebar
+**When** the folder is created
+**Then** a corresponding subdirectory is created in the storage path
+**And** sheets can be dragged into it
+
+**Given** the `.calcpad` file format
+**When** a sheet is saved
+**Then** the JSON contains the sheet's lines, variable state, metadata (title, created date, modified date), and format version