>>The SYS(3) function returns the number of miliseconds since midnight as a string.

? INT(Seconds()*1000), Sys(3)

It's valid file name but invaliad alias. What error do you get?
>>
>BTW, where did you get this info? It doesn't tell in HELP how does this function work. It even doesn't specify directly, that it returns string consisting of all numbers (it only alludes that).

Ok, mystery continues. I just tried in Command Window:

CREATE TABLE 123 (Class C(40)) and it works fine. Why it doesn't work in the code?

< UPDATE > I just realized, why! It's because I do not have full environment and I just do not have wistemp directory...