ren- turns file into a folder

[Davidovsky]

This script renames a txt file but for some reason turns it into a folder, and thereafter the folder does not delete each time but they accumulate.
I just want to rename a file.
*scratches head*
 

Code:

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str s
DATE d.getclock
s.timeformat("{D} {hhmmss}" d)
str n.from("g:\last backup " s ".txt")
ren- "g:\last backup*.txt" n