EscapeE 'eE' iconEscapeE provides two mechanisms for avoiding output files overwriting existing files on Export.

with Do not overwrite files check-box ticked
If a subsequent file is created which would have the same name as a file in the list, EscapeE appends "#1", "#2" etc. to the new file's name automatically. This ensures that each file name is unique and that no existing files are overwritten.
with the box unchecked
EscapeE maintains a list of output files that have been created from the most recently opened file. It appends "1", "2" etc. to the name if it would be the same as one created earlier in the run (but not considering any pre-existing files). The file list is cleared when a input new file is opened.