Build spectral library from Byonic searching results

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Hi,

I used the mizd files exported from Byonic to build a spectral library. My file name is:
***.raw_20171214_Byonic.mzid
However, after I added those files, an error came out.
The error says: 
Cound not find spectrum file
***.raw_20171214_Byonic[MGF|.mzXML|.mzML] in current directory.
My Skyline is version 3.7.0.10940.
I am kind of confused now. I thought that among mzid, mgf, mzXML, and mzML files, mzid file is the only type of file that can be used to build a spectral library. But why is the file shown in the error has those other extensions? 
How can I fix this problem?
Best,
Qiongyu