diff --git a/app/pages/package-code/[[org]]/[packageName]/v/[version]/[...filePath].vue b/app/pages/package-code/[[org]]/[packageName]/v/[version]/[...filePath].vue
index c7d74034aa..96e2ee5c15 100644
--- a/app/pages/package-code/[[org]]/[packageName]/v/[version]/[...filePath].vue
+++ b/app/pages/package-code/[[org]]/[packageName]/v/[version]/[...filePath].vue
@@ -147,13 +147,13 @@ const currentNode = computed(() => {
 
 const isViewingFile = computed<boolean>(() => currentNode.value?.type === 'file')
 
-// Estimate binary file based on mime type
+// Estimate binary file based on MIME type and the detected source language
 const isBinaryFile = computed<boolean>(() => {
   if (!isViewingFile.value) return false
 
   const contentType = fileContent.value?.contentType
   if (!contentType) return false
-  return isBinaryContentType(contentType)
+  return isBinaryContentType(contentType, fileContent.value?.language)
 })
 
 const isFileTooLarge = computed<boolean>(() => {
diff --git a/app/utils/file-types.ts b/app/utils/file-types.ts
index cc3991b1c5..e198d71e12 100644
--- a/app/utils/file-types.ts
+++ b/app/utils/file-types.ts
@@ -21,7 +21,13 @@ const BINARY_MIME_PREFIXES = new Set([
   'application/octet-stream',
 ])
 
-export function isBinaryContentType(contentType: string): boolean {
+export function isBinaryContentType(contentType: string, language?: string): boolean {
+  // CDNs use octet-stream for source formats they don't recognize. The server
+  // already identifies their language from the path; 'text' is its unknown fallback.
+  if (contentType.startsWith('application/octet-stream') && language && language !== 'text') {
+    return false
+  }
+
   for (const prefix of BINARY_MIME_PREFIXES) {
     if (contentType.startsWith(prefix)) {
       return true
diff --git a/server/api/registry/file/[...pkg].get.ts b/server/api/registry/file/[...pkg].get.ts
index da250d9026..f2f4f92fa0 100644
--- a/server/api/registry/file/[...pkg].get.ts
+++ b/server/api/registry/file/[...pkg].get.ts
@@ -7,7 +7,7 @@ import {
   ERROR_PACKAGE_VERSION_AND_FILE_FAILED,
 } from '#shared/utils/constants'
 
-const CACHE_VERSION = 3
+const CACHE_VERSION = 4
 
 // Maximum file size to fetch and highlight (500KB)
 const MAX_FILE_SIZE = 500 * 1024
diff --git a/server/utils/code-highlight.ts b/server/utils/code-highlight.ts
index e0eb6bb885..7af121fbe1 100644
--- a/server/utils/code-highlight.ts
+++ b/server/utils/code-highlight.ts
@@ -69,6 +69,7 @@ const FILENAME_MAP: Record<string, string> = {
   'package-lock.json': 'json',
   'pnpm-lock.yaml': 'yaml',
   'yarn.lock': 'yaml',
+  'bun.lock': 'jsonc',
   'Makefile': 'bash',
   'Dockerfile': 'bash',
   'LICENSE': 'text',
diff --git a/test/unit/file-types.spec.ts b/test/unit/file-types.spec.ts
new file mode 100644
index 0000000000..790d6e1f86
--- /dev/null
+++ b/test/unit/file-types.spec.ts
@@ -0,0 +1,30 @@
+import { describe, expect, it } from 'vitest'
+import { isBinaryContentType } from '~/utils/file-types'
+
+describe('isBinaryContentType', () => {
+  it.each(['svelte', 'astro', 'typescript', 'jsonc'])(
+    'previews recognized %s source served as octet-stream',
+    language => {
+      expect(isBinaryContentType('application/octet-stream', language)).toBe(false)
+      expect(isBinaryContentType('application/octet-stream; charset=utf-8', language)).toBe(false)
+    },
+  )
+
+  it.each([undefined, '', 'text'])('keeps unknown octet-stream files binary (%s)', language => {
+    expect(isBinaryContentType('application/octet-stream', language)).toBe(true)
+  })
+
+  it.each(['image/svg+xml', 'application/wasm', 'application/zip', 'font/woff2'])(
+    'keeps explicit binary MIME type %s binary even with a recognized language',
+    contentType => {
+      expect(isBinaryContentType(contentType, 'xml')).toBe(true)
+    },
+  )
+
+  it.each(['text/plain', 'text/javascript', 'application/json'])(
+    'previews text MIME type %s without a recognized language',
+    contentType => {
+      expect(isBinaryContentType(contentType)).toBe(false)
+    },
+  )
+})
diff --git a/test/unit/server/utils/code-highlight.spec.ts b/test/unit/server/utils/code-highlight.spec.ts
index 6408b13288..566fcaad49 100644
--- a/test/unit/server/utils/code-highlight.spec.ts
+++ b/test/unit/server/utils/code-highlight.spec.ts
@@ -173,6 +173,11 @@ describe('linkifyModuleSpecifiers', () => {
 })
 
 describe('getLanguageFromPath', () => {
+  it('recognizes text bun lockfiles without treating binary lockfiles as text', () => {
+    expect(getLanguageFromPath('nested/bun.lock')).toBe('jsonc')
+    expect(getLanguageFromPath('nested/bun.lockb')).toBe('text')
+  })
+
   it('prefers well-known filenames over extension heuristics', () => {
     expect(getLanguageFromPath('foo/README.md')).toBe('markdown')
     expect(getLanguageFromPath('nested/tsconfig.json')).toBe('jsonc')