Urgent- can't open mac .fla on pc

1

I created a flash file on a pc, then opened it no bother on my mac. Did some work to it, saved and emailed it to my other machine (a pc) but can’t open it at all now. I have had these problems before when trying to open a pc .fla on a mac, but never the other way round. If someone out there couild be as helpful as to open the file on a mac and send it back to me I would be forever grateful.