I need to align a column of numbers using decimal tabs in Word 2007, but the numbers in a particular document have a space as the thousands separator (e.g., "12 345.67" rather than "12,345.67"), and Word is treating the space as a decimal point rather than as a thousands separator (i.e., it is aligning the space, rather than the decimal point, at the tab). I tried using non-breaking spaces, but that made no difference. How can I fix this in this document?