{
  "added_at": "2026-10-17",
  "additional_evidence_urls": [
    "https://github.com/morluto/rea/pull/1272"
  ],
  "category": "official-case-studies",
  "description_en": "REA’s case traces the installed Windows Calculator model DLL to explain different percentage behavior for multiplication/division and other operations. An analyst-selected function is interpreted against public Microsoft source and demonstrated with fixed browser examples.",
  "description_zh": "REA 案例追踪已安装 Windows Calculator 的模型 DLL，解释乘除运算与其他运算中不同的百分比行为。分析人员选定函数后，对照微软公开源码解释，并通过固定输入的浏览器示例演示。",
  "entry_url": "https://awesomerea.org/resources/rea-calculator-percent-case/",
  "entry_url_zh": "https://awesomerea.org/zh/resources/rea-calculator-percent-case/",
  "evidence_url": "https://github.com/morluto/rea/blob/c360cfcd6d7901514b16dd6113eba2e0b0fdf422/website/evidence/calculator-and-dino.md",
  "group": "rea",
  "id": "rea-calculator-percent-case",
  "json_url": "https://awesomerea.org/resources/rea-calculator-percent-case/record.json",
  "kind": "case-study",
  "markdown_url": "https://awesomerea.org/resources/rea-calculator-percent-case/index.md",
  "markdown_url_zh": "https://awesomerea.org/zh/resources/rea-calculator-percent-case/index.md",
  "name": "Windows Calculator: reconstructing percentage rules",
  "name_zh": "Windows Calculator：重建百分比规则",
  "record_type": "resource",
  "relationship": "official-case-study",
  "requirement_facets": [
    "scope",
    "attribution",
    "license"
  ],
  "requirements": [
    "The documented target is Calculator 11.2508.4.0 x64. The public source commit is an interpretation cross-check, not an identified build commit for that installed DLL.",
    "Function selection was analyst-assisted.",
    "This reconstructs a bounded arithmetic rule, not the Calculator application. Public Microsoft source is MIT-licensed; access and rights to the installed target remain separate."
  ],
  "requirements_zh": [
    "文档目标为 Calculator 11.2508.4.0 x64。公开源码提交用于解释交叉核对，不是已确认生成该 DLL 的构建提交。",
    "函数选择有分析人员协助。",
    "这只重建有限的算术规则，不是整个 Calculator 应用。微软公开源码采用 MIT；已安装目标的访问和权利另行处理。"
  ],
  "targets": [
    "app",
    "binary"
  ],
  "url": "https://github.com/morluto/rea/blob/c360cfcd6d7901514b16dd6113eba2e0b0fdf422/website/evidence/calculator-and-dino.md#windows-calculator",
  "verification": "source-reviewed",
  "verified_at": "2026-10-17"
}