how set previewOnHover work with binary file (or just special file format: like pdf)?

[WillDawnlll]

1. work with many diffrent format file mix (text & binary) , i usually use coc-exp to preview them .so i can get vim syntax highlight .
   but binary file seem dont show preview window , and its contain text info in head, (like pdf) .
   so can i config coc-exp to use prevewOnHover show binary file ?

2. or just open file in normal window , but cursor still in coc-exp (look like use normal file context window to preview instead of hover float window),

3. thanks for this OSM plug again!

[weirongxu]

Not currently supported and not planned, but perhaps in the future we can using extensions to support it