Links: Those are for Mac. I assume you are
not using a Mac and downloaded them by mistake, right?
If I'm correct, and you downloaded them:
1) from the website: look on the top left of the menu where you got the files from, there should be a "System: ..." menu that allows to choose the OS you want the installers for (Windows, Mac, or Linux).
2) from Galaxy's "Backups & goodies": the menu is on the top right of the download links list, but says "OS:" instead of "System"
Yup that's sorted it! Can only assume I somehow hit the system drop down and switched it to Mac the first time around and didn't notice!