.TPD File Extension
File Type 2TreePad 7 Database File
This file is saved in a binary format, which requires a specific program to read its contents.
.TPD File Association 2
File created by TreePad 7 or later, a personal information manager; stores information that is structured as a hierarchy of "nodes," each of which stores document content such as text, images, hyperlinks, structured data, and other personal content.
NOTE: Prior to TreePad 7, the software used the .HJT file extension for databases.