I found a soul, I'm not sure that it is correct, but it works. In tinyMCE.init, I added:
paste_auto_cleanup_on_paste : true, paste_postprocess : function(pl, o) {
Here is the whole tinyMCE init:
function addTinyMCE_Authors_AffiliationsWord() { jQuery('#dialog-authors_affiliations_parsing').tinymce({ script_url: '/js/tiny_mce_3.2.7_jquery/jscripts/tiny_mce/tiny_mce.js', width: "800px", height: "250px", mode: "textarea", theme : "advanced", plugins : "paste", // Theme options theme_advanced_buttons1 : "pasteword", theme_advanced_buttons2 :"", theme_advanced_buttons3 :"", theme_advanced_buttons4 :"", theme_advanced_toolbar_location : "bottom", valid_elements : "p", paste_auto_cleanup_on_paste : true, paste_postprocess : function(pl, o) { // remove   o.node.innerHTML = o.node.innerHTML.replace(/ /ig, " "); } }); }
ENJOY ...
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