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Urgent help required to open XLIFF file with hexadecimal problem...

Trados expert would be very very welcome. Sigh. 
Got an XLIFF file created in Trados 2015 which won't open and I get this error:

'.', hexadecimal value 0x00, is an invalid character. Line 53734, position 59.

I was working on it, saving regularly but yes - my bad - not all the lines were confirmed. But I am sure the data is there in the file.

I'm absolutely sure there is a solution as these websites show but if someone proficient in Trados and used to handling XML could help me quickly sort the file and render it loadable, I would be extremely grateful. (I could send it over)

http://producthelp.sdl.com/kb/Articles/3671.html

http://www.proz.com/…/193742-trados_studio_invalid_characte…

Thanks and hoping for some helpful person !
I am currently rushing around and a little difficult to stop and download and process all the steps listed above.
Rich