As noted, Windows compatibility SDBs are binary patches. Online viewers cannot parse them. Look at the file size: Windows SDBs are usually 10-200KB, while database SDBs are larger (1MB+).
specialized tool for extracting "Fix-It" patches from Windows SDBs. Key Technical Limitations Proprietary Encryption sdb file online viewer
The most reliable โonlineโ method is using a cloud-hosted instance of (Collabora Online or Nextcloud with Collabora). As noted, Windows compatibility SDBs are binary patches