If you want to change the way FBReader display things, you can change the UI.XML in the same way as mentioned in
https://www.mobileread.com/forums/showthread.php?t=22084
By the way, the trick also works for Mobipocket Files if you prefer to read them with FBReader.
The windows version of your script is a bit more involved. But - if you have the free
7-Zip program installed, the next line will do the trick (from within a .CMD file):
FOR /F "TOKENS=1* DELIMS=." %%F IN ('dir /b *.pdb') DO "C:\Program Files\7-Zip\7z" u -tzip "%%F.fb2.zip" "%%F.pdb"
Good luck,
Wiffel