But it doesn't make grammatical or mathematical sense. A full stop (a.k.a. period) indicates decimals in maths. In literature, it indicates a stop, or the end of a sentence. A comma indicates that there's more to read.
Quite frankly, I don't know why people would write 1.000,1 instead of 1,000.1, especially if they're using numbers. You wouldn't do the same in maths, no matter what country you're from. It's completely off-the-wall.
Incidentally, the place I first learned about different separators in different countries was from the old Numbers control panel in good old Mac OS 7.