HTML form upload for ODT files / MIME type for *.odt -

i'm looking html form upload odt-files. need know parameter accept.

<form method="post" action="upload.php" >       <input type="file" name="file_upload" accept="" />       <button type="submit">upload</button> </form> 

with search in stackoverflow found have define correct mime type.

for odt mime type application/vnd.oasis.opendocument.text

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the html code has that:

<form method="post" enctype="multipart/form-data" action="upload.php" >       <input type="file" name="file_upload"               accept="application/vnd.oasis.opendocument.text" />       <button type="submit">upload</button> </form>