Thanks Normmatt !
But do you know which "pack_data.pak" is red in this log ? Because i don't find any at 0x27E356C...
And how do you get this log ? With the debug version of NO$GBA ?
I definitely still have a lot to learn
0x27E356C is just a FILE pointer. the second argument is the place its read to in memory and third is number of bytes read.
and that /pack_data.pak is the one in root of file system hence the single /
EDIT: The log is from my custom desmume.