Acually, the apps themselves were stored on the SD card, data and all. Linked, with App2SD. They ran from the card instead of internal storage. And then I asked App2SD to clean the partition, which usually would mean that it cleaned up extraneous files that weren't being used in any way. Only this time it delted pretty much everything that was there. Now I want to recover it, preserving the directory structure and everything. Apparently this is easy if you have a PC, and there is plenty of software that can do it. But I only have that tablet and a lousy old Chromebook.
Why in this day and age is there anything smartphone-related that you can only do if you have a PC? It's ridiculous. There has to be a way of doing this, even if no one bothered to make the software.
Failing this, is there any recovery software that can be used to find ALL deleted files, and not just photos or videos or other certain types?