Excel 2003+ exports are actually being saved as .mhtml documents. How to export as true .xls?

Question

Hi All,
I am new to OBIEE and was confused about why exporting report views to Excel renders them as .mhtml documents.
I am using version 11.1.1.5.0
What I have tried doing so far is this:
Open Dashboard
Click 'Export' link under my target Analysis within the Dashboard
Excel 2003+
Save As: "SampleFileName.xls" /// type: Microsoft Excel 97-2003 Worksheet
Open the saved file
Get the following warning:The fild you are trying to open, 'SampleFileName.xls', is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now?
Click 'Yes'
(the file opens)
Click 'Save As'the default 'Save as type' shows "Single File Web Page (*.mht, *.mhtml)
I was told to look into using the Delivery Manager APIs to see if I could export the Analysis as a clean Excel document. Is this the right place to look? If so, how would I go about implementing? Are there certain permissions I need within OBIEE in order to implement?
If you have other suggestions, please let me know.
Thanks!

Answer 1

I managed to dramaticaly reduce the embedded code, by changing some export settings detailed below. It appears to be the fonts embedded as base64 by default. The following works well at reducing the size although not completely eliminating it.
options.embedRasterImages = false;
          //options.compressed  = true;
          options.includeFileInfo = false;
          options.preserveEditability = false;
          //options.includeVariablesAndDatasets = true;
          //options.slices = true;
          options.fontType = SVGFontType.OUTLINEFONT;
    options.fontSubsetting = SVGFontSubsetting.None;
    options.optimizeForSVGViewer = true;