I am currently using nero premium 7.5.9.0, i would like to enquire whether does realone/realmedia file format are they recongised by nero? As on a few occasions whenever i tried to add in the burning window, the system prompt me with an error message "Unable to locate the filename in the specific directory". It occurs to other file formats like .avi also even though the file is that specific directory. Any remedies for this problem anyone?

According to Nero 7 [FAQ Search]

Nero Vision 4 can convert AVI, MPEG, or MPEG-2 to VOB, IFO and BUP format structure.

You need to have the DVD Encoder installed for this conversion (already included in the full version of Nero 7 Premium).