Recovering that data for use in new emulators is an advanced, and older topic: check old versions of the FAQ. Here is a list of the cases we know: If you find any other game for which automatic savetype detection does not work, please let the developers know by posting on the forum or submitting a bug.
If you want to fix it yourself, you may need to manually specify the correct save type for your game.
We put these at the top, hoping that it will cover 90% of questions and cut down noise in the forum.   For extra credit, contemplate why this might have changed. Don't waste time asking, it will only make us angry. If a game really doesn't work, no matter what you try, you can submit a bug report for the game. If you are running De Smu ME on a laptop, then a laptop cooler might help.
If you can't make it work, then give up and go buy the cart. If you create new threads in our forum about these games, don't be surprised if they get closed or deleted depending on how obnoxious they are. Uncheck display input De Smu ME is a very CPU demanding app.
Don't run De Smu ME from the zip file you received it in. De Smu ME tries to remember the window position, but windows implements show desktop by setting the window position to something like x=-32000 and so that gets saved.
There is supposed to be some code to handle that case, but I guess it is not working well.
Read #De Smu ME_runs_too_slow.21 for more information on how to improve emulation performance.
And remember that it is a balance -- gaining extra performance will always mean that you need to give up some features or reduce compatibility somewhere. Listed below are things you can do to improve De Smu ME's performance.
If it seems that the forum functions according to arbitrary or subtle rules, then it is because it does, and it you may get an inkling of them here: How To Ask Questions The Smart Way Also keep in mind that De Smu ME is a powerful tool and can't work by magic; it requires some careful operational skills. Next time, try saving earlier and dont ignore this warning:  or  Next time, try saving earlier, and if it doesnt work, think hard about whats going to happen, and try the suggestions under "I am having any problem whatsoever!