Ah - you're doing it the hard way... - What I did was install 'Homebrew Browser' & downloaded the savegamemanager through that
On your SD card you should have an 'apps' folder
Inside that you'll need a 'savegame_gx' folder
Inside THAT you need to place the R081.dol file
RENAME that file to 'boot.dol'
So you should have
- apps > savegame_gx > boot.dol
You normally should also have a 'icon.png' and a 'meta.xml' file in this folder - but I beleive those are not THAT important
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Now put SD card back into Wii & start up/boot - & then run 'Homebrew Channel'
You should now have a new option called 'Savegame Manager GX' (but since you don't have the png/xml files - you won't see a small graphic or a description to the program)
Go ahead & load it....
If things go well - you should then get a screen up that looks a little like the Wii mainchannel menu along the bottom, & 2 large boxes on the top 2/3 of the screen
The left hand side should show al the games it has found, the right should show the contents of your SD card
Press the [ B ] button on Wiimote to select the lefthand column of games
Scroll down to 'Animal Crossing' & press [ A ] - you should then get an option to 'extract'
Select that & it'll extract the save file onto your SD card
Once done - you should end up with the required DAT file somewhere on the SD card - which you can then edit to your hearts content (I recommend you do a backup in case things go wrong before editing)
Once done - save the dat back to SD card & go through the same as above to start up 'SaveGameManager'
except when you get to the 2 large boxes - make sure the RIGHT haand box is selected, scroll down to animal crosing sav and press [ A ]
you should then get the option to 'Delete' or 'Install' - use the 'install'