You can read directly in jPreTeX
a LaTeX file, and modify
it easily.
In order to do this, click on "Open
a Document" button : a dialog box opens.
Then choose in the combo box "Files
of type" the "TeX Files"
item.
You have all the TeX
files contained in the current directory. You can navigate among the
directories.
Then choose the file you are interested in. jPreTeX converts it in a jPreTeX document, adding "bis" to its name.
Of course the conversion may not be perfect, but this can allow you to
work with colleagues not having jPreTeX
!