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[M.Max]

bah, i never checked that.
You need to set the actual filename path after setting the bitmap.
So add this line before the last one:

vr.output_splitfilename = btm_filename

edit: before you ask, it's a Max thing with bitmap paths.

aha, thank you!
After 15 years of using Max I've learnt to never ask. Max works in mysterious ways after all : ))

glorybound
Here is the updated script.
it is under Autopath Elements name now

MacroScript AutosetpathElements
category:"Mr.Max"
toolTip:"Auto set path Elements "
(
vr = renderers.current
vr.output_on = true
vr.output_splitgbuffer = true
tempName =maxfilepath + Maxfilename
trimedName= trimRight tempName ".max"
btm_filename = trimedName + ".exr"
tempmap = Bitmap 1 1 fileName:btm_filename
save tempmap
close tempmap
vr.output_splitbitmap = tempmap
vr.output_splitfilename = btm_filename
deleteFile btm_filename
)

[^Lele^]

You forgot the closing bracket!

[M.Max]

You forgot the closing bracket!

Oops! thanks for the heads up!