HOW.TXT How to update the MIME Database E:\com\mindprod\mimecheck\mimes.csv Modify the CSV file. It has five different record types, that may appear in any order, though normally kept sorted. P, extension, mime (for primary mime type ) S, extension, mime (for secondary mime type ) C, extension, comment (for a comment about the extension ) A, extension (this is an audio mime) V, extension (this is video mime) W, extension (this is a core extension, should be supported on a typical website) Make sure file names in com.mindprod.mime.Generate are suitable. Edit as needed. Then Run Generate in the IDE. It generates include HTML for mime.html and sound.html directly in the E:\mindprod\jgloss\include directory. Then regenerate mimetypes.jar to include the newly genereate E:\com\mindprod\mimetypes\mimes.ser