can you check if the dr.ini file in the X:\system folder on your DR1000 shows something "strange"? There are entries for different filetypes. Mine doesn't show an entry for *.mht file but it does contain this line:
/apps/er/sys/ctb/filetypes/doc-html/extensions=htm;html;xhtml;
two more things you could try:
1) change the file extension to *.mhtml
2) rename the dr.ini file to dr.old.ini , reboot, your DR1000 will make a new dr.ini file. You will loose your personal settings (lock sensors, language etc) , but if it doesn't help and make the *.mht files visible you can always return to your original settings
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