Sorry, I'm not going to let you link to random builds on google drive when we have a buildbot making all the latest up to date builds. Link to that instead.

only people who had their system taking automated backups. the battery save may have become broken when you loaded the broken state. loading a fixed state would bring a fixed save file along with it.

smaller how much

and your evidence that 999 hours has anything to do with it is....?

actually the most likely explanation is that you updated desmume versions and expected the savestates to be compatible

i dont think so. but why are you invading someone else's thead?

then your .duc converter is garbage. try file > import backup memory in desmume and choose the duc

desmume won't know to import the .sav unless its name matches the name of the .dsv exactly. look at the NameOfTheFile.dsv and delete it; then rename the sav to NameOfTheFile.sav. Now desmume will know how to import it. it should STILL drop out a .dsv, but this time it will contain the .sav it imported

saves aren't in a ds0 format. savestates are in a ds0 format. you cannot turn a .duc (save file) into a savestate (.ds0 file). You must turn a .duc (save file) into a .dsv (save file) or a .sav (raw save file)

you can't just take a file from ??? and rename it to .dsv and hope it works. You need to find a converter online to convert it to raw save or desmume save format; if it's raw save, you can use file > import backup memory. Or you can just hope it's a raw save file already and rename it to .sav and import it. If importing it doesn't work, one thing to try (you can do this trick with any emulator) is to look where desmume drops the .dsv file it wants to create. close the emulator, delete that, and put the raw .sav in the same place. desmume may pick that up and auto-import it into its dsv format

The main reason we made bizhawk is so that it was less horribly painful adding more features to those tools.
My plan was to put desmume core in bizhawk, get the better tools automatically, and stop supporting windows frontend, but it's been a few years and that may still be a few more years...

Having a simpler version of an advanced tool is NOT an adequate justification to keep garbage around in desmume's already garbaged-up codebase. I'll leave it because fintogive asked me to but I'm not going to add features to it. If you put a bug on github, maybe one of the guys who works on cheats and tools will do it, but I will warn you now, I will edit your feature request for it to be complimentary to the cheat search dialog. For instance if you say "add a bulk eliminate button to the cheat search dialog" you will discover later that it says "add a bulk eliminate button to the complementary, wizard-like cheat search xanadu-like roses-smelling steak dinner dialog for fine people with discriminating tastes"