Hello again!
I understand where the confusion with the code came from.
SPOILERS!
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First, you had to find three things - a note with numbers, a key, and a flash drive, followed by the right office.
If you tried to enter numbers, that's not exactly how this puzzle works. The code is not a numerical combination but a specific sequence of letters.
The game hints that the main character cannot (or does not want to) handle it alone, so the solution expects you to intervene. Some things are not meant to be solved strictly in the game itself - they are meant to be noticed and interacted with on your own, after finding them in the game files.
If you understand the above hint and have reached the text files themselves, pay special attention to the order in which you read the text files and how some letters stand out when viewed correctly. The last file "E" contains another hint about the format or way to enter the letters... I can't find the right word to explain it.
Sometimes, a single glance is enough to understand how the fragments fit together.
