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LadyKate - as I already wrote, you can look at the format files from a browser via the server, it will open in the OS default - e.g. calibre ebook-viewer for ePUB, Acrobat for PDF, WMP for MP3 etc.
To make my life easy I keep a book folder in each of my 'permanent' calibre Libraries with -- Author: 'zzAdminstrivia', Title : 'Server on NNNN', Tags : '_administrivia'. And into that I drop a .CMD file containing the calibre-server command and a .LNK file containing the command to start a browser with the matching port number. This is what it looks like:
Two clicks is all it takes. And the 'book' is easy to locate in a file manager, so if calibre desktop is busy accessing another library (e.g. my Intake library), I can invoke the .CMD and .LNK files from it.
And it only needs baseline calibre and Windows - no plugins, custom columns, regex expressions, calibre templates, shell extensions, TSR gadgets etc etc.
BR