Nope. RAM disks are used, because the homebrew cannot access the SD card, meaning the .img file cannot be written.
I suppose it's old homebrew that was made before the DSi was around.
Thanks a lot. That makes sense.
When I run TWiLight Menu++ from a flashcard, ZXDS works fine. I guess ZXDS is looking directly for the flashcard's SD card, which just isn't available when the flashcard isn't fired up.
When running TWiLight Menu++ from the flashcard though (a timebombed R4 SDHC Gold Pro RTS (r4isdhc dot com)), TWiLight Menu freezes now and then, and freezes every time I try to launch a rom (tried sms and gg so far). I wonder if there's a fault with the card, but it does work fine with its stock timebombed launcher.