{
  "experiment": "native-excel-reopen-library-roundtrips",
  "prepared_execution": true,
  "started_utc": "2026-11-15T07:02:27.2909160Z",
  "cases": [
    {
      "input": "expense-original.xlsx",
      "charts": 2,
      "seconds": 2.0593291,
      "formula_cells": 69,
      "queries": 1,
      "pivots": 1,
      "output": "reopened-expense-original.xlsx",
      "check_value": 686500,
      "formula_errors": 0,
      "result": "opened-and-saved"
    },
    {
      "input": "expense-roundtrip.xlsx",
      "error": "Unable to get the Open property of the Workbooks class",
      "seconds": 0.049453199999999996,
      "result": "error"
    },
    {
      "input": "monthly-original.xlsx",
      "charts": 1,
      "seconds": 0.5480975,
      "formula_cells": 1814,
      "queries": 0,
      "pivots": 0,
      "output": "reopened-monthly-original.xlsx",
      "check_value": 1988001.06,
      "formula_errors": 0,
      "result": "opened-and-saved"
    },
    {
      "input": "monthly-roundtrip.xlsx",
      "charts": 1,
      "seconds": 0.48302239999999996,
      "formula_cells": 1814,
      "queries": 0,
      "pivots": 0,
      "output": "reopened-monthly-roundtrip.xlsx",
      "check_value": 1988001.06,
      "formula_errors": 0,
      "result": "opened-and-saved"
    }
  ],
  "excel_version": "16.0",
  "excel_build": 20527,
  "native_seconds": 4.0054262,
  "api_ms": 7035,
  "controller_seconds": 7.112892195999848,
  "per_task_usd": null,
  "cost_boundary": "Existing isolated research pilot; no attributable per-task operating cost measured.",
  "prior_attempt": {
    "reason": "Initial COM SpecialCells range count overcounted expense formulas as 74. Replaced with Formula-array cell count and reran; ZIP inspection of saved output independently counts 69. Same file-open outcomes in both attempts."
  }
}