cannot read plan file Archicad 23

[busera]

I was using Archicad 23, I had removed it from the laptop before. .bak file was giving an error I changed the .bak file extension to .pln file, it gives an error that the plan file cannot be read, what should I do now?

[Mahmoud Qenawi]

Read this helpful guide prepared by @mtron and edited by @Rubia Torres 

https://community.graphisoft.com/t5/Project-Management-articles/File-Damage-or-Corruption-Troublesho...

[Lingwisyer]

.bak? Not .bpn?

Are not .bak files only generated during the save process and removed after? If AC died mid save I would assume that the .bak file would be incomplete and hence most likely unreadable...

Ling.

[Laszlo Nagy]

I agree with Lingwisyer, a BAK file is not an Archicad Project Backup, you need to look for a file with the same name as your project and having the BPN extension.