how to fix win8.1 LibreWriter 5.1.1.3 is saving the documents in UOT File

how to fix win8.1 LibreWriter 5.1.1.3 is saving the documents in UOT File

File assotiation command (in windows registry) made with this mistake: HKCR\LibreOffice.Docx\shelløpen\command : “C:\Program Files (x86)\LibreOffice 5\program\swriter.exe” -o “%1” “program\” should be “program” Not only for Docx type file. Then I corrected this mistake it was more than 200 changings
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I have found this report regarding my problem and I am very sorry that no one knows about.
Well I hope somebody can tell me now
what to do to fix my problem

MY PROBLEM IS :
“C:\Program Files (x86)\LibreOffice 5\program\swriter.exe” -o “%1”
LibreWriter is saving documents in UOT File
HOW TO FIX THIS PROBLEM???
Thank you
Ettore