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macropod · 07-09-2015, 05:12 PM

Yes, 512Mb is the limit. To have created a 1.2Gb file, you must have many large graphics, etc. in there.

You will be able to open the file again if you delete enough of those graphics, etc. to get the file size below 512Mb. Here's how:
• change the file extension to .zip, to turn it into a zip archive (which is all docx/docm files are, anyway);
• open the resulting zip archive; and
• start selecting the largest images. They'll have names like image1.jpg, image2.jpg, etc. Similarly, embedded Excel workbooks will have names like Microsoft_Office_Excel_2007_Workbook1.xlsx, etc.
• once you've selected enough of these objects to get the document below 512Mb, delete them from the zip archive
• change the file extension back to .docx or docm, as appropriate.
You will now be able to open the file.
Wherever possible, you should replace your graphics with lower-res copies that have no more than 300dpi resolution at the size they will be printed in the document. You will probably need to do this for images that weren't deleted, as well as for any you re-insert/add, to keep the file size below 512Mb. If you let Word compress your embedded graphics (by unchecking the 'do not compres images in file' option, under File|Options|Advanced>image Size and Quality), it will reduce them to 220dpi (or lower, if you tell it to).