A PDEX file is an encrypted data file created by Orient Computer encryption software. It contains a file that has been encrypted for security purposes, such as protecting against malware infection or unauthorized access. PDEX files may be created by ProtectData, Mail Protect, OricomSecureFP, and Security Folder.

PDEX files are saved in an encrypted format that is only supported by the Orient Computer program that created the file. PDEX files may be used for various purposes depending on the program that creates it. Mail Protect creates PDEX files to protect the contents of email and Security Folder creates PDEX files to protect users' files from ransomware attacks.