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Question :

How do I recover corrupted/damaged files? How do I resolve the error messages ‘The loaded data is corrupt!’ and ‘Unable to read layer no???!’?


Answer :

It seems that your tb...XXX.ndw file or your pb...YYY.npl layout has been corrupted; this may have occurred as a result of an unexpected shutdown of allplan, a micro-cut in the network or the presence of corrupted 3D elements which cause an error when saving the current file.

The Allplan files concerned are :

• Drawing file                      tb...XXX.ndw
• Layout                              pb...YYY.npl

To access the folder containing these files, launch ALLMENU then click on ‘Maintenance’ then ‘Windows Explorer’ then on ‘Custom CAD Projects (PRJ)’.



Step 1 : You can check for the presence of a tb...XXX.ndw.bak or pb...YYY.npl.bak file; if it exists and is not too old, you can use it to start from this version: simply rename your tb...XXX.ndw file to tb...XXX.ndw.broken and then delete .bak from the file you want to use.


Note that ‘.bak’ files are not always present and are created randomly.

Step 2 : If you don't have one or it's too old, you can try recovering a backup of the tb...XXX.ndw or pb...YYY.npl file from your server or NAS: servers (or NAS) use different backup technologies; by opening the properties of the XXX or YYY file, and accessing the property tab, you can recover earlier versions:



Alternatively, you can contact your company's IT department to find out if you can recover a backup of your file. If you work on a server, it is not uncommon to be able to access daily or half-day backups.

Hint : The technical department is sometimes able to recover part of the file if you send it to us, but we cannot guarantee the status/success of this recovery.