Hi JP,
Are you doing anything in Premiere, or just taking a file and dropping it straight into Encore? Your file is 16:9 with 1.0 PAR (square pixels). Have you tried right-clicking on it in the bin and try Interpret? You may need to TELL Encore how to treat the file.
Otherwise, drop file into Premiere, and Export using Media Encoder, using an MPEG-2 DVD widescreen preset, and then use the resulting assets in Encore.
Thanks
Jeff Pulera
Safe Harbor Computers