by Jon Ripley, May 2007

To read the MIME type of a file call FN_GetMIMEType passing it a file extension, for example:
      PRINT "The MIME type of a .html file is ";FN_GetMIMEType("html")

The code for FN_GetMIMEType is:
      DEF FN_GetMIMEType(T$)
      LOCAL B%, H%, L%, R%, T%
      L% = 255 : DIM B% LOCAL L%
      SYS "RegOpenKeyEx", &80000000, "."+T$, 0, &20001, ^H% TO R%
      IF R% = 0 THEN
        SYS "RegQueryValueEx", H%, "Content Type", 0, ^T%, B%, ^L% TO R%
        REM Uncomment the next line to set a default MIME type if none is found
        REM IF R% $$B% = MIMEDefault$
        SYS "RegCloseKey", H%
      ENDIF
      = $$B%
FN_GetMIMEType returns an empty string if no MIME type is found in the registry for the requested file extension. To set a default MIME type for all unknown extensions uncomment the specified line and replace MIMEDefault$ with your fail safe type.