I wrote my own classes to handle TQ .dat files, and I will share here the code. I hope it would help somebody.
The files contains examples of usage, but feel free to ask anything.
Full source code in the attachments.
EDIT:
- Updated TQDatCryption class (new version 1.1) to allow seeking.
- Added new class SeekableCryptoStream (fully tested).
Both with full source code in the attachments.






