by default BotB will detect filetypes by their extensions
validating the filetypes is another potential process
jpg, jpeg, png, gif & mp3 have filetype validating already

'[#[currently known]
The following mime types are already in the code.  If you can think of some that are missing please add them below this section.

'[t[code]
     js application/x-javascript 
     json application/json 
     jpeg, jpg image/jpg 
     png, gif, bmp, tiff image/'strtolower($fileSuffix[1])'
     css text/css 
     xml application/xml 
     doc, docx application/msword 
     xls, xlt, xlm, xld, xla, xlc, xlw 
     xll application/vnd.ms-excel 
     ppt 
     pps application/vnd.ms-powerpoint 
     rtf application/rtf 
     pdf application/pdf 
     html, htm, php text/html 
     txt text/plain 
     mpeg, mpg, mpe video/mpeg 
     mp3 audio/mpeg3 
     wav audio/wav 
     aiff, aif audio/aiff 
     avi video/msvideo 
     wmv video/x-ms-wmv 
     mov video/quicktime 
     zip application/zip 
     tar application/x-tar 
     swf application/x-shockwave-flash 

     prg application/program-binary.unknown 

     vt application/vic-tracker 
     sid application/sid-commodore-64 
     tia application/tia-atari 
     sap application/pokey-atari 
     mod, s3m, xm, it application/s3xmodit 
     nsf application/nintendo-sound-file
     dmc application/nsf.sample 
     sho application/shroom-player.mariopaint

    default : unknown/'strtolower($fileSuffix[1])'
'[/t]

libgme gstreamer plugin uses these mime types: 
audio/x-ay
audio/x-gbs
audio/x-gym
audio/x-hes
audio/x-kss
audio/x-nsf
audio/x-sap
audio/x-spc
audio/x-vgm

'[#[fill in the blank]
d64 application/commodore-disk-image