Hi, i wanna ask u something

yesterday i trade my pokemon in pokemon emerald with VBLINK

after i got my pokemon, i save my data and the save file is save.sg1
next, i renamed the save.sg1 become save.sgm

afer that, 1 opened my VBA and open Pokemon emerald ROM

but if i open the save.sgm from VBlink data, my VBA get closed because of eror

i dunno where was my mistake?

please help me guys
thanks