Need help - Any way to exclude a directory from playing?

[Gorkde]

I got 2 types of soundfiles on the card.

One type (normal sounds) should be played randomly when a specific occurence is met.
Another sound (an alarm sound) should only be played at alarm conditions.

I placed the alarm sound in a subfolder but using "next" to play the next file sooner or later jumps in the alarm subdirectory and plays the alarm under normal conditions as well.

So ist there any way to exclude one file or directory from playing?
Or is there any way to only play files in a specific directory once you use the next command?