diff --git a/port/win/io_win.cc b/port/win/io_win.cc
index 64ded8465d0..76b168fed9e 100644
--- a/port/win/io_win.cc
+++ b/port/win/io_win.cc
@@ -175,60 +175,17 @@ Status ftruncate(const std::string& filename, HANDLE hFile,
   return status;
 }
 
-size_t GetUniqueIdFromFile(HANDLE hFile, char* id, size_t max_size) {
-
-  if (max_size < kMaxVarint64Length * 3) {
-    return 0;
-  }
-#if (_WIN32_WINNT == _WIN32_WINNT_VISTA)
-  // MINGGW as defined by CMake file.
-  // yuslepukhin: I hate the guts of the above macros.
-  // This impl does not guarantee uniqueness everywhere
-  // is reasonably good
-  BY_HANDLE_FILE_INFORMATION FileInfo;
-
-  BOOL result = GetFileInformationByHandle(hFile, &FileInfo);
-
-  TEST_SYNC_POINT_CALLBACK("GetUniqueIdFromFile:FS_IOC_GETVERSION", &result);
-
-  if (!result) {
-    return 0;
-  }
-
-  char* rid = id;
-  rid = EncodeVarint64(rid, uint64_t(FileInfo.dwVolumeSerialNumber));
-  rid = EncodeVarint64(rid, uint64_t(FileInfo.nFileIndexHigh));
-  rid = EncodeVarint64(rid, uint64_t(FileInfo.nFileIndexLow));
-
-  assert(rid >= id);
-  return static_cast<size_t>(rid - id);
-#else
-  FILE_ID_INFO FileInfo;
-  BOOL result = GetFileInformationByHandleEx(hFile, FileIdInfo, &FileInfo,
-    sizeof(FileInfo));
-
-  TEST_SYNC_POINT_CALLBACK("GetUniqueIdFromFile:FS_IOC_GETVERSION", &result);
-
-  if (!result) {
-    return 0;
-  }
-
-  static_assert(sizeof(uint64_t) == sizeof(FileInfo.VolumeSerialNumber),
-    "Wrong sizeof expectations");
-  // FileId.Identifier is an array of 16 BYTEs, we encode them as two uint64_t
-  static_assert(sizeof(uint64_t) * 2 == sizeof(FileInfo.FileId.Identifier),
-    "Wrong sizeof expectations");
-
-  char* rid = id;
-  rid = EncodeVarint64(rid, uint64_t(FileInfo.VolumeSerialNumber));
-  uint64_t* file_id = reinterpret_cast<uint64_t*>(&FileInfo.FileId.Identifier[0]);
-  rid = EncodeVarint64(rid, *file_id);
-  ++file_id;
-  rid = EncodeVarint64(rid, *file_id);
-
-  assert(rid >= id);
-  return static_cast<size_t>(rid - id);
-#endif
+size_t GetUniqueIdFromFile(HANDLE /*hFile*/, char* /*id*/, size_t /*max_size*/) {
+  // `FileIdInfo` is not supported. The possible alternative,
+  // `BY_HANDLE_FILE_INFORMATION::nFileIndex{High,Low}`, allows deleted files'
+  // IDs to be reused for newly created files. Since we don't evict from block
+  // cache before deleting a file, this introduces a risk that readers access
+  // obsolete data blocks.
+  //
+  // Returning 0 is safe as it causes the table reader to generate a unique ID.
+  // This is suboptimal for performance as it prevents multiple table readers
+  // for the same file from sharing cached blocks, but at least it's safe.
+  return 0;
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////