diff --git a/AGENTS.md b/AGENTS.md
index 672ee9e..8f9e1ed 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -7,6 +7,7 @@ This file is the project's committed home for project-intrinsic agent knowledge:
 ## Project notes
 
 - The published package entry point and OpenCode tool registration live in `src/index.ts`; the reader, safety checks, format registry, and media extraction are split across `src/`.
+- `src/registry.ts` resolves `officeparser` through named, default, and top-level exports because OpenCode's Bun loader can leave the named `OfficeParser` binding undefined even for version 7.5.1.
 - Run `npm run check && npm test` for the local typecheck and executable fixture suite. The DOCX, ODT, and PPTX fixtures are generated as real ZIP archives by `test/fixtures.ts`.
 
 ## Maintaining this file
diff --git a/src/registry.ts b/src/registry.ts
index d9cafd4..8e7128f 100644
--- a/src/registry.ts
+++ b/src/registry.ts
@@ -1,13 +1,62 @@
-import { OfficeParser } from "officeparser";
+import * as officeParser from "officeparser";
 import type { OfficeParserConfig, SupportedFileType } from "officeparser";
 import type { RichDocumentFormat } from "./types.ts";
 
-function officeFormat(parserType: SupportedFileType): RichDocumentFormat {
+type ParseOffice = RichDocumentFormat["parse"];
+
+interface OfficeParserModuleValue {
+  OfficeParser?: unknown;
+  default?: unknown;
+  parseOffice?: unknown;
+}
+
+interface ResolvedParser {
+  parseOffice: ParseOffice;
+  receiver: unknown;
+}
+
+function moduleValue(value: unknown): OfficeParserModuleValue | undefined {
+  if ((typeof value !== "object" && typeof value !== "function") || value === null) return undefined;
+  return value as OfficeParserModuleValue;
+}
+
+// Bun's CJS interop can leave the named OfficeParser binding undefined while
+// retaining the default class and top-level parseOffice export.
+function resolveOfficeParser(value: unknown, seen = new Set<object>()): ResolvedParser | undefined {
+  const candidate = moduleValue(value);
+  if (!candidate) return undefined;
+
+  const reference = value as object;
+  if (seen.has(reference)) return undefined;
+  seen.add(reference);
+
+  for (const nested of [candidate.OfficeParser, candidate.default]) {
+    const resolved = resolveOfficeParser(nested, seen);
+    if (resolved) return resolved;
+  }
+
+  if (typeof candidate.parseOffice === "function") {
+    return { parseOffice: candidate.parseOffice as ParseOffice, receiver: value };
+  }
+  return undefined;
+}
+
+function parserFor(module: unknown): ResolvedParser {
+  const parser = resolveOfficeParser(module);
+  if (!parser) throw new TypeError("officeparser does not expose a parseOffice function");
+  return parser;
+}
+
+export function createOfficeFormat(
+  parserType: SupportedFileType,
+  parserModule: unknown = officeParser,
+): RichDocumentFormat {
   return {
     extension: `.${parserType}`,
     parserType,
     parse(input: Uint8Array, config: OfficeParserConfig) {
-      return OfficeParser.parseOffice(input, { ...config, fileType: parserType });
+      const parser = parserFor(parserModule);
+      return parser.parseOffice.call(parser.receiver, input, { ...config, fileType: parserType });
     },
   };
 }
@@ -20,7 +69,7 @@ function officeFormat(parserType: SupportedFileType): RichDocumentFormat {
 export const formatRegistry: ReadonlyMap<string, RichDocumentFormat> = new Map(
   ["docx", "odt", "pptx"].map((format) => {
     const parserType = format as SupportedFileType;
-    return [`.${format}`, officeFormat(parserType)] as const;
+    return [`.${format}`, createOfficeFormat(parserType)] as const;
   }),
 );
 
diff --git a/test/read-rich-document.test.ts b/test/read-rich-document.test.ts
index 37f1dec..3c73c5b 100644
--- a/test/read-rich-document.test.ts
+++ b/test/read-rich-document.test.ts
@@ -2,18 +2,23 @@ import assert from "node:assert/strict";
 import { after, before, describe, it } from "node:test";
 import { mkdir, readFile, realpath, rm, stat, symlink, writeFile } from "node:fs/promises";
 import { basename, dirname, join, relative } from "node:path";
-import type { OfficeParserAST } from "officeparser";
+import type { OfficeParserAST, OfficeParserConfig } from "officeparser";
 import { RichDocumentReaderPlugin } from "../src/index.ts";
 import { READER_LIMITS } from "../src/limits.ts";
 import { readRichDocument } from "../src/reader.ts";
+import { createOfficeFormat } from "../src/registry.ts";
 import { createFixtures } from "./fixtures.ts";
 
 let fixtures: Awaited<ReturnType<typeof createFixtures>>;
 const extractedDirectories = new Set<string>();
 
 function context() {
+  return projectContext(fixtures.root);
+}
+
+function projectContext(projectRoot: string) {
   const abort = new AbortController();
-  return { directory: fixtures.root, worktree: fixtures.root, abort: abort.signal };
+  return { directory: projectRoot, worktree: projectRoot, abort: abort.signal };
 }
 
 function rememberExtraction(result: { metadata?: { media?: Array<{ temporaryPath: string }> } }) {
@@ -40,6 +45,49 @@ describe("plugin registration", () => {
 });
 
 describe("read_rich_document", () => {
+  it("resolves named, default, and top-level officeparser exports", async () => {
+    const ast = {} as OfficeParserAST;
+    const calls: OfficeParserConfig[] = [];
+    const parseOffice = async (_input: Uint8Array, config: OfficeParserConfig) => {
+      calls.push(config);
+      return ast;
+    };
+    const namedParser = { parseOffice };
+    const defaultParser = Object.assign(function OfficeParser() {}, { parseOffice });
+
+    for (const parserModule of [
+      { OfficeParser: namedParser },
+      { default: defaultParser },
+      { parseOffice },
+      { OfficeParser: undefined, default: defaultParser, parseOffice },
+    ]) {
+      const format = createOfficeFormat("docx", parserModule);
+      assert.equal(await format.parse(new Uint8Array(), {}), ast);
+    }
+
+    assert.deepEqual(calls.map(({ fileType }) => fileType), ["docx", "docx", "docx", "docx"]);
+  });
+
+  it("reads the supplied pesticide records DOCX with content and metadata", async (t) => {
+    const projectRoot = process.env.OPENCODE_RICH_DOCUMENT_SMOKE_ROOT;
+    if (!projectRoot) {
+      t.skip("set OPENCODE_RICH_DOCUMENT_SMOKE_ROOT to run the external supplied-document smoke test");
+      return;
+    }
+
+    const sourcePath = "docs/maint-div/Pesticide Application Records.docx";
+    assert.equal((await stat(join(projectRoot, sourcePath))).isFile(), true);
+
+    const result = await readRichDocument({ path: sourcePath }, projectContext(projectRoot));
+
+    assert.match(result.output, /Pesticide Application Records/);
+    assert.match(result.output, /Applicators Name/);
+    assert.ok(result.metadata);
+    assert.equal(result.metadata.format, "docx");
+    assert.equal(result.metadata.sourcePath, sourcePath);
+    assert.deepEqual(result.metadata.media, []);
+  });
+
   it("extracts DOCX structure, media, and section association without default attachments", async () => {
     const result = await readRichDocument({ path: "structure.docx" }, context());
     rememberExtraction(result);