Does the file you are importing end in ".FP7" ?
Can you just open it with filemaker on the windows machine rather than import?
"I have a mac fm pro 10 data file and when i try importing the file to windows fm pro 10 the file is not recognized.."
Do mean a FMP database file, or an exported data file from a FMP database?
What is the filetype? CSV (comma separated data file)? or other?
How was the file transferred? over a network, on a USB flash drive or a CD?
You should be able to open the same file on a mac and pc. No import needed.