Converting .xkr files to .mp4 format.
Converting Sing Magic Karaoke Song Format directly to MPEG-4 Videos (.xkr to .mp4 conversion) doesn't seem possible, as the XKR file format is proprietary to Sing-Magic Karaoke and cannot be converted to any other media format.
We are not aware of any media editing software or (online) conversion tool capable converting XKR to MP4.
In a word, direct xkr to mp4 conversion is not possible.
So don't expect any so-called xkr to mp4 converter or xkr to mp4 free online conversion tool available.
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