Opening a .pdb file depends on what created the file. There are several programs that create a .pdb file. The most common is a program database file which can be opened with a program like Quicken. Mac has a program called simply "PDB Viewer" to open these types of files. A create resource to help in determining which type of file it is and what will open it, go to
. http://www.fileinfo.com/extension/pdb.
