[Tom Line]

Please note that if you are using windows and have the option turned on that hides file extensions, by naming the file ".bin", you've really named it ".bin.bin" since windows is hiding the file extension.

Find this options in the folder you're working in under tools -> folder options -> view -> hide extentions for known file types (should NOT have an X in it).

Also, by executable, they mean there should be nothing in the root directory of the USB drive except your file. Even better, just wipe the thumb-drive out and ONLY have that one file on it.