You are trying to open a .brd file saved in Allegro version 22.1 or 23.1 using the 17.4 viewer.
: For viewing Cadence .brd files natively, the Allegro Free Physical Viewer is unmatched in compatibility and feature set. The alternatives either require file conversion or lack critical functions like cross‑probing and layer‑specific measurements.
Which of the above would you like?
The 17.4 viewer offers a robust set of features tailored for deep design inspection without the risk of accidental modifications.
Inspect the mechanical fit of the board, components, and enclosures using the integrated 3D viewing tool. System Requirements for Version 17.4 allegro free physical viewer 174 download link
The Cadence Allegro Free Physical Viewer 17.4 is an essential tool for engineers, PCB designers, manufacturers, and project managers who need to open, view, and measure Cadence Allegro PCB layout files without requiring a paid software license. Whether you are reviewing a design for manufacturing or checking trace layouts, this viewer provides complete visibility into complex PCB designs.
| Requirement | Specification | | :--- | :--- | | | Windows 7 (64‑bit) or newer (Windows 10/11 recommended) | | Processor | 1 GHz or faster, 64‑bit (x64) | | RAM | 4 GB minimum (8 GB recommended for large designs) | | Disk Space | ~1.5 GB for full installation | | Display | 1024×768 or higher; high‑DPI scaling may require manual adjustment | | Additional Software | Microsoft .NET Framework (installed automatically if missing) | You are trying to open a
Measures precise distances between traces, pins, vias, and board edges.