for what i can save map in .sxl ? with what program i can edit it? can you tell me and write some links, where i can download program to edit .sxl files and links with tutorials how to edit it.
And how can i set the position of cp and intel while i'm making a map?

Im afraid that you can't set the position of the CP and Intel. Because they are randomly dropped everytime.

There is no way to predetermine the location of the cp or intel, nor is there any use for the sxl file. AoS only uses vxl files and add's it's own "sky" (which is fog) and "sprites" (which are the characters/guns etc.) There is no need for any other kv6 sprite or sky in AoS (although tbh I still haven't successfully imported a custom sky into voxed yet...)

What r sxl files?