This is how to get the 6th secret tape in Amanda The Adventurer.
*Note: You cannot find this tape in game.*

Here is how you get the tape.

So first you will search on the search bar, "Run"
You will type in "Run", "%appdata%"
Then you will exit Roaming and go to LocalLow.

In LocalLow, You will look for a folder named, MangledMaw.
In MangledMaw you will find Amanda The Adventurer.
In Amanda The Adventurer, you will right-click on save.sav and press Open with....
If you press Open with... You will be showed a screen that asks you to choose your app to open the file.
You will choose Notepad. or Notepad++.

Then in the file, Look for the term, "SecretTapesUnlocked = (insert number of secret tapes unlocked here)"
You will change that number to 6.

Then you will have the sixth tape of Amanda The Adventurer!
And if you had less than 5 secret tapes, You would get those tapes as well!