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For those who have the same problem: the only way I found to locate the generated files was with a third party application like ES File Explorer. By the PC it does not show the files. While saving the files I did the following:
myfile.open("/storage/emulate/0/suaPasta");
I thought that by recording using android NDK it would save in a different location.
To view the files by PC you have to move by ES File Explorer to a folder that has access by PC like the camera folder or the Downloads folder or to the memory card.