How to find the csl file extension?

I created a new citation style and now I want to import it to zotero. I put everything into the Notepad and now I want to save it as a csl-file, but it is not posible to choose it in the saving-panel...there are a lot of options (cs, c, csb) but not csl...do I have to install something in order to habe the citation style language as an option?
Thanks
  • save it as a .txt make extensions visible in Windows,
    http://windows.microsoft.com/en-us/windows-vista/Show-or-hide-file-name-extensions
    then rename the file from
    mystyle.txt to mystyle.csl

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