I dont know what you mean with "application"
Ah, an application is just another word for computer program / software. For example, Nisus Writer Pro, TextEdit, and Microsoft Word are all applications. We need to know exactly which application/program displays your text incorrectly.
Orientalist wrote:Arabtest.doc does not display Arabic correctly. But by opening it with TextEdit everything os OK.
...
(I have in the Mac Windows Office 2008 for Mac but I dont like it)
Microsoft Word for the Mac does not handle right-to-left languages.
So I can send my documents to collegues written and edited in Nisus Writer, exported as .doc by TextEdit or PDF.
Are you saying that ".doc" files exported by TextEdit open properly, but ".doc" files exported by Nisus Writer do not open properly? Which application/program are your colleagues using to view your file?