The operating systems on the two computers are completely irrelevant.
Of course it may very well be correct if the file you sent was created
by some 3rd party application in a proprietary file format, and your
recipient doesn't have that same (or a compatible equivalent)
Resend the file in a format that your recipient can read.
Help us help you:
They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety. ~Benjamin Franklin
Many people would rather die than think; in fact, most do. ~Bertrand Russell
The philosopher has never killed any priests, whereas the priest has
killed a great many philosophers.
~ Denis Diderot