mac datapath question

hi guys! i need some help about standalone versions of apps produced with unity for windows and mac. i have some data that must be available in run time. so this is what i did. i compiled windows build. in the _DATA folder i put the folders with images. i code i made sure that paths are correct and everything is working fine. i even made the installed with nullsoft installer software and everything works fine. but the same thing does not work on mac. i used transmac software to package mac app. in data folder i put the data but it does not read it. i do not have experience for mac, can somebody point where i should look for bug or how to resolve this issue.

is it better to use resource folder for this purpose? thanks!