Ok I spent a lot of time trying to find out how to edit retroarch saves and I've finally got it. What you want to do is inject the save into your policenauts save data. What you need to find out first is whether you saved to the system RAM or a Memory Cartridge, it should tell you when you save the game. Install and use
this program in order to inject the tokimemo save into it. I also extracted the save into its raw format so use
this one instead.
BACKUP YOUR SAVES IN CASE SOMETHING GOES WRONG
Step 1) Open the retroarch save file which is usually located in: C:\Users\YourUserName\AppData\Roaming\RetroArch\saves
a .bcr file is for the backup cartridge and .bkr is the internal system RAM. Choose the one that has your save data.
(If you're not sure just open them both and see which one has saves in it) Also make sure you have file extensions enabled in windows explorer or the files wont have those extensions at the end making it harder to differentiate.
When you see a window popup make sure to select Raw Mode from the drop down menu and then your saves should show up as shown in the image.
Step 2) Now click on setup and then go to the insert tab and change the insertion mode to Raw and click ok:
Step 3) Now you can inject the tokimemo save by clicking on insert and locating the raw save file I provided above. When the prompt comes up to confirm the injection copy and paste this: ﾄｷﾒｷｹﾞｰﾑ01 into the comment field and then click ok:
Step 4) You should now see the newly injected save in the list, what you need to do next is click save, keep the File I/O mode in Raw mode, then overwrite the old file by clicking it so it retains the same name and file extension and then hitting save. Remember what file had your save so you don't end up overwriting the wrong file. .bcr and .bkr are the file extensions so make sure you picked the right one.
This should work since I tested it by loading up the save in the beetle saturn core and loading up Tokimemo so it should work with your Policenauts save as well. This is the only way for the game to notice the Tokimemo save since each game just creates its own .bkr and .bcr file which is just emulating the real Cartridge and Internal RAM.
