Well, using Far Manager i could find the file at tpa/system/messaging/mms/vol_main/3/Gravando.amr, and it is like 150kb big.
I already tried copying it using SEtool (but it only gave me 0 byte files) , and far manager + JD patcher, which obviously also didnt work.
I did a lot of searching and found some things :
1) ***CUSTOMIZATION and BACKUP OF YOUR PHONE***INSTALLING ICONS WITHOUT FAR/XS++*** - Top Sony Forums. On this thread, it shows how to backup the FS, using a XML file that has commands to make the cell copy its own memory to the memory card. However, i couldnt even copy 0 byte files, as far manager says it doesnt know how to read any of the files on the cell phone memory. So, i studied the XML file that resulted from the whole process and came up with this :
<?xml version="1.0" encoding="UTF-8"?>
<customization>
<file-operations>
<file-op parse-mask="fa" op="copy" source="tpa/system/messaging/mms/ vol_main/out/3/Gravando.amr" dest="card/other/backup/Gravando.amr"/>
</file-operations>
</customization>
I copied this XML thing into tpa/preset/default, like the tutorial said, it was supposed to work. But it didnt, when i turned on the cell phone, it didnt even show anything telling me to wait or didnt copy anything on the memory card.
I also read about a quick access patch to make the cell phone allow file copying, but QAMAKER said the firmware I downloaded from this very site isn't readable.
Any clues ?