While using a new feature of MeGUI, I realized that
there seems trouble with accent caracters in AVS scripts.
I attached the temporary avs script generated by MeGUI.
The problem consists in these two lines:
file="C:\Documents and Settings\Sven
c = WriteFile(c, file, "a", "sep", "b")
AviSynth blames that it can't open the file for writing.
Taking out the "ó" of the filename make's the thing
work, so this is the caracter which makes avisynth fail.