But if you do want to move the files from ST to MAC/PC then simply format a disk on the PC to 720K (you may need to use tape or somthing to block hols up on a 1.44Mb disk, not good but works).
Once this is done simply copy the files to the disk and move the disk between each computer. I do not know if the MAC can read PC disks but if not then there must be a program to do it.
This is a simple method of moving files.
You could go on and use cables, etc to "send" the files to each machine but it is more work and is not worth the truble unless you are going to do it a lot.