i spent a good hour figuring my method and this is gonna be tricky so "bear" with me:
1. open game and save
2. go to the directory mentioned and thru the chrome extension whatever that says INDEXED at its end (not level), after reaching the end of those folders you will see a number, open it in notepad ++
3. depending on how it looks to you, it may be easy or hard, so if you get a bunch of "NUL" icons in between letters or numbers, it's gonna be hard, if not, it will be easier. More on this later.
4. for this example we will go with the one everyone truly wants :'D tapes. search "834289414177008", you will see that after it, it has the number 0 (if its a fresh save), just bump it up to 9 and save, then load your game, it SHOULD load it, and give you the 9 tapes.
5. start a night, get a tape to turn that into a 2 digit, exit the place or get caught, whatever lets you keep your tapes.
6. Save and repeat process 4, this time you will have a higher count, turn that into 99 (see where this is going?)
7. See if it loads, and if it does, repeat step 5.
8. Repeat the same step 4, this time turn that 100+ into 999, save and load.
9.???
10.profit.
3a. So if for some reason you get a glitchy mess that has the word "nul" between every letter or number, do the following:
-scroll all the way down (or right) to the end, click on any letter so the marker is there.(or just do the next step from the get go)
-search only the number 8 and instead of "find next", do a "find previous" (the up arrow), it should start taking you back to all the previous 8s, the code we are looking for is technically near the end so its easier to search previous (on wrap around mode).
-keep searching while keeping an eye out for when you get (8 NUL " NUL : NUL)
-when you find that, find previous again, and see if the numbers between the NULs match the original " 834289414177008 ", so basically see if you get (8 NUL 9 NUL 4...) to ensure you are finding the code that ends in 7008.
-depending on how much your tape count is in digits, just replace its value number with a 9 for each one, example, if you are on double digits, just replace the numbers only so you have (8 NUL " NUL : NUL 9 NUL 9 NUL)
-hit save and then attempt to load the game, if done right it SHOULD let you load it
NOTE: usually saving the game deletes your save data number into a new number, example, you save and get the number 4, when you save again it might delete it and replace it with the number 5, so you might be having to reload on N++.
hopes the instructions are as clear as they can be.