.PB1 File

File extension pb1 seems to be related to very old program called 3D Home Architect by Broderbund, which was used to create drawings and simple architecture blue-print plans.

The exact purpose of pb1 files is uncertain, but it might be a drawing or one of the internal data file used by the program.

This pb1 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

How to open:

It is likely that you can open .pb1 files only in 3D Home Architect.

How to convert:

The only possible way to export or convert this type of .pb1 files might be with 3D Home Architect.