Requirements:
WiiScrubber v1.40;
nfs2iso2nfs v0.5.4; it may require the Wii common Key. You can use wiiscrubber's key.bin renamed to wii_common_key.bin.
A clean rip of your Wii game;
The extracted contents of a Wii VC title for the Wii U (except the .nfs files);
-the 2 below require java to be installed-
jnustool (requires Wii U common key so you'll have to search online - hint: it begins with D7B0. Open the "config" file in notepad and paste the key inside, replacing [COMMONKEY]);
NUSpacker (must be @ihaveamac's version, requires Wii U common key as well)

Current limitations:
It's possible to use the gamepad to emulate ONLY the Classic Controller.
Wii Remote emulation is possible but there's no gyroscope or infrared commands (at least for now).
(Input emulation patches by @FIX94)

The game must be already compatible with the Classic Controller but that isn't a guarantee that it's going to work.
Here's a compatibility list: http://wiki.gbatemp.net/wiki/WiiU_VC_Wii_inject_compatibility_list

Integrity checks are still in place so only clean disc rips work.
The game iso must be pristine: untrimmed, unscrubbed and the partitions signed.
No homebrew, no mods, no wimmfi patched games until sigpatches are implemented.
Patched isos work now! Original idea by @Tock46!

Homebrew works now, even a special version of Nintendont by @FIX94

Trimmed isos still don't work, at least not isos trimmed by WiiScrubber.



HOW TO DO IT


0. Downloading a Wii VC Title
This may be illegal and I'm just telling you so you don't ever do it by mistake OK?
You can use the command line to download games' contents directly if you know the title id and title key.
I heard you can get them on a certain titlekeys site...

Once you have that, this is the command

java -jar JNUSTool.jar TITLEID TITLEKEY

Note: You should get a game that contains the latest revision of fw.img (r590), that's the only version supported by @FIX94's patches.
Here's some info you can use to verify that you have a good file:
Size: 1785497 bytes.
CRC32: E2F27E9B
MD5: 3CAF52A9A440EEE4F125A3AD22E305C8
SHA: A5A75EBF3164874830A1D5992495DE510AB3F74E

Now here's a list of some titles that contain the preferred fw.img (verified mostly by @fejich and @markehmus)
DONKEY KONG JUNGLE BEAT [VBXE01]
Kirby's Epic Yarn [VARE01]
Lost in Shadow [VA8E01]
Mario Strikers Charged [VBFE01]
Mario Super Sluggers [VBHE01]
Pandora's Tower [VAPE01]
PIKMIN 2 [VBTE01]
PIKMIN [VBUE01]
Resident Evil 4 Wii Edition [VBDE01]
Resident Evil The Umbrella Chronicles [VBWE01]
Rhythm Heaven Fever [VAKE01]
Sin and Punishment Star Successor [VALE01]
Super Mario Galaxy [VBKJ01]
Super Paper Mario [VBBE01]
The Legend of Zelda Skyward Sword [VANE01]
Trauma Team [VA6E01]
Wario Land Shake It [VBGE01]
WARIO WARE SMOOTH MOVES [VBVE01]





-----------------------------------------------

1. WiiScrubber
First setup WiiScrubber. Remember it needs the Wii common keys so run MakeKeyBin.exe first and do as it says.
Run it and open you iso. Right-click the UPDATE partition and select "Delete partition". Confirm.

Now click on the + box to expand the DATA partition, then expand partition.bin.
Right click tmd.bin, select "Extract" and save it.
Do the same with ticket.bin.

Rename the extracted ticket.bin to rvlt.tik
Rename the extracted tmd.bin to rvlt.tmd

Copy/move both files to the "code" folder of the Wii VC title.

Your iso is now ready and you can close WiiScrubber.


2. nfs2iso2nfs
Move your iso to the "content" folder of the Wii VC. Rename the file to "game.iso".
The content folder should contain only game.iso and the "assets" folder. Delete any nfs files that are still present.

Copy nfs2iso2nfs.exe to the content folder and run it. If everything is in place, it will begin the conversion process.
It should take around 15 minutes. Its console window will close when it's finished.
Once it ends you can delete your iso file and nfs2iso2nfs.exe (and wii_common_key.bin if it exists).
The content folder should contain only the nfs files and the "assets" folder.

Optional: You can enable Classic Controller emulation for playing using only the gamepad.
Open meta.xml (it's in the meta folder) in notepad.
Look for the line

<drc_use type="unsignedInt" length="4">1</drc_use>

replace it with

<drc_use type="unsignedInt" length="4">65537</drc_use>

and save the file.
Note that this will only work if the game supports the Classic Controller.
If it doesn't either it won't boot or you won't be able to do anything and only the gamepad's power button will work.
Here's a list of such games: https://wiki.gbatemp.net/wiki/List_of_Wii_games_compatible_with_Classic_Controller


3.NUSpacker
The final part, building the installation files.
NUSpacker requires the Wii U common key. You should find it online and then open the file "encryptKeyWith" with
notepad and paste the key inside (hint: it begins with D7B0)

It's also a command line tool so you'll have to write down the commands, or simply create a new text file,
write the command inside, save it and change the extension from .txt to .bat

I recommend copying the Wii VC folder (that contains the other 3 folders, code, content and meta) to nuspacker's folder.
That will make everything easier.

The command works like this (replace with the names of your own folders)
If you folders have spaces in their names, enclose them in quotation marks, like "Just Dance".

java -jar nuspacker.jar -in GAME_FOLDER -out INSTALATION_FILES_FOLDER

Wiait until it finishes the process.
Now just copy the folder with the installation data to the "install" folder SD card, run a CFW and install it with WUP Installer GX2!

PS: If you make a nonfunctional game, remember to uninstall it before trying again.
If you install a fiunctional game over a broken installation, it will still appear as broken.

 

[pedro702]

just wondering is there any way to make the games lunched run at the wiiu cpu speed? is there some flag or codding that makes the wiiu cpu slow down to wii speed on the files or fw?

 

[Columbo2811]

Anyone has tried sonic unleashed yet?

Will try it now. Along with sonic colors, castlevania judgement and DiRT 2. Will take about an hour or so to do all 4.

 

[cucholix]

I don't use a bat file. I open a command line so it doesn't close, and the input folder with code content and meta has 11 NFS files and it's 2,58GB. And the output folder with app and h3 files it's 2,62 GB
PD: This is a different thing, if I use an iso patches for use wiimmfi servers, do I need to patch the base game FW.img? Or it's only for games with mods?

The output should be 4,12 or so, at least you are using other tools? I don't think getting trimmed wup is possible yet, idk.
Have enough space in your HDD during the process?

 

[AxlSt00pid]

WiiXplorer can explore NAND files?
I wasn't even aware that app could do such a thing.
It's an interesting idea, though, perhaps it could lead to something if it can indeed run under Wii VC.

Yep, WiiXplorer let's you explore your current NAND, and as I said I think that Wii VC games have the fw.img file mounted as the current Wii NAND

 

[ShadowOne333]

Yep, WiiXplorer let's you explore your current NAND, and as I said I think that Wii VC games have the fw.img file mounted as the current Wii NAND

Might be worth the shot, although I am not sure if anyone has tried launching WiiXplorer yet through Wii VC.

 

[asper]

Tested Paper Mario both USA and PAL (on a PAL console) with nfs2iso2nfs 0.4 and it gives black screen after de Wii logo (no controller patch applied). I used full .ISO (4GBs) with deleted update partition. Base VC was mario galaxy 2.

 

[crowfeathers]

Well, this is a neat tool. I tried it with a game I remember supporting the Classic Controller, Chocobo Dungeon, but apparently it's similar to RE4 in that you have to press A on the wiimote first. Disappointing.

 

[Peninsula]

Current limitations:
Emulating other controllers is possible but requires patching fw.img.

Does this mean adding GC adapter support for Wii games on Wii U would finally be possible?

 

[moops44]

yeah thx 4 the credits
nice hijack from the DRC Value founder

https://gbatemp.net/threads/decrypting-wii-vc-nfs-files.452426/#post-6909813

 

[hippy dave]

Has anyone started uploading these injects to "those sites" yet? If not, please do

Anyone tried other games with classic controller hacks yet?

BTW thanks to those who made this happen, very cool.

 

[Columbo2811]

Anyone has tried sonic unleashed yet?

Yep it works. It does detect gamepad as wiimote and nunchuck at first so there's a wiimote cursor on the screen and the buttons are kinda reversed in game, but in the options menu you can change to classic controller and everything seems fine.
All these games tested working great with gamepad as controller

Spoiler: Games working

 

[ShadowOne333]

Has anyone started uploading these injects to "those sites" yet? If not, please do

Anyone tried other games with classic controller hacks yet?

BTW thanks to those who made this happen, very cool.

Afaik only NSMB Wii and DKCR have Classic Controller hacks, I don't know if there are more with said hacks.
We need to patch the ISOs, though, and for what I know, the hacks are only available as cheat codes.
So we need someone who knows a little bit about cheat codes and how to convert them to the ISO at hand.

 

[victormr21]

The output should be 4,12 or so, at least you are using other tools? I don't think getting trimmed wup is possible yet, idk.
Have enough space in your HDD during the process?

I didn't trimmed or scrubed it with WiiScrubber, and yes there was enough space on NAND and USB

 

[ploggy]

Is it possible to exchange the Main.dol of a wii iso with a homebrew one and have it boot correctly?

 

[victormr21]

Yep it works. It does detect gamepad as wiimote and nunchuck at first so there's a wiimote cursor on the screen and the buttons are kinda reversed in game, but in the options menu you can change to classic controller and everything seems fine.
All these games tested working great with gamepad as controller

Spoiler: Games working

Idk why that FIFA 15 icon is calling me
Also can you share MKWii meta? I only have perfect DRC and TV boot screen, I couldn't find a decent icon.
Also, are you planning upload some games? I can't get no one working and I want MKWii with GamePad support
Bye!

 

[KiiWii]

Would it be possible to make the main.dol a game selector to pick from a multitude of games from each base game?

 

[tatumanu]

Wow this is cool! Does that mean you can inject nintendon't into a Wii VC and play gamecube with the gamepad?

 

[hippy dave]

Afaik only NSMB Wii and DKCR have Classic Controller hacks, I don't know if there are more with said hacks.
We need to patch the ISOs, though, and for what I know, the hacks are only available as cheat codes.
So we need someone who knows a little bit about cheat codes and how to convert them to the ISO at hand.

Couple more in this thread, but yeah there don't seem to be many. Good point about converting cheat codes to iso patches tho.

 

[Columbo2811]

Idk why that FIFA 15 icon is calling me
Also can you share MKWii meta? I only have perfect DRC and TV boot screen, I couldn't find a decent icon.
Also, are you planning upload some games? I can't get no one working and I want MKWii with GamePad support
Bye!

Here you go. Ive made mine to like original wii vc games

 

[Saiklex]

Getting a really weird problem now, was testing Fire Emblem and using the Gamepad as a Classic Controller doesn't quite work. It detects it as if it's a wiimote, which means up/down/left/right is mapped instead to left/right/up/down, X and Y are 1 and 2 respectively A and B are A and B, and no other buttons work except + and -. Anyone else getting this issue and know a possible fix? The meta.xml is as it should be,
<drc_use type="unsignedInt" length="4">65537</drc_use>