Filetypes have hierarchical names of the form G1:G2:G3, and in the "match(filetype)" condition you can specify filetypes as G1:G2:G3, or G1:G2 (less specific), or G1 (generic). The list of currently (version 2.8.2) recognized filetypes comprises:

IMAGE:COMPRESSED:JPG
    IMAGE:COMPRESSED:PNG IMAGE:COMPRESSED:JPG IMAGE:COMPRESSED:GIF
    IMAGE:COMPRESSED:TIFF IMAGE:COMPRESSED:PCX IMAGE:RAW:BMP
    IMAGE:RAW:XPM IMAGE:SPECIAL:AUTOCAD IMAGE:SPECIAL:COREL
    IMAGE:SPECIAL:FITS IMAGE:SPECIAL:VISIO IMAGE:SPECIAL:DICM
    IMAGE:SPECIAL:PHS IMAGE:SPECIAL:XCF MOVIE:COMPRESSED:RIFF
    MOVIE:RAW:MOV MOVIE:COMPRESSED:MPG MOVIE:COMPRESSED:QT
    MOVIE:COMPRESSED:FLI MOVIE:COMPRESSED:FLASH
    MOVIE:COMPRESSED:WMV AUDIO:RAW:SND AUDIO:RAW:EMOD AUDIO:RAW:MOD
    AUDIO:RAW:WAVE AUDIO:RAW:DEC AUDIO:STANDARD:MIDI
    AUDIO:COMPRESSED:REAL AUDIO:COMPRESSED:OGG
    AUDIO:COMPRESSED:FLAC AUDIO:COMPRESSED:MP3
    ARCHIVE:COMPRESSED:LHA ARCHIVE:COMPRESSED:RAR
    ARCHIVE:COMPRESSED:ZIP ARCHIVE:COMPRESSED:7Z
    ARCHIVE:COMPRESSED:COMPRESS ARCHIVE:COMPRESSED:GZIP
    ARCHIVE:COMPRESSED:BZIP2 ARCHIVE:COMPRESSED:ARJ
    ARCHIVE:COMPRESSED:HPAK ARCHIVE:COMPRESSED:JAM
    ARCHIVE:COMPRESSED:SQUISH ARCHIVE:COMPRESSED:CAB
    ARCHIVE:COMPRESSED:ZOO ARCHIVE:COMPRESSED:XPK
    ARCHIVE:PACKAGE:RPM ARCHIVE:PACKAGE:DEB ARCHIVE:UNIX:AR
    ARCHIVE:UNIX:TAR LIBRARY:JAVA:CLASS DOCUMENT:OFFICE:WORD
    DOCUMENT:OFFICE:EXCEL DOCUMENT:OFFICE:WORD DOCUMENT:OFFICE:ALL
    DOCUMENT:ADOBE:PDF DOCUMENT:ADOBE:EPS DOCUMENT:STANDARD:RTF
    DOCUMENT:ID:VCARD EXECUTABLE:DOS:EXE EXECUTABLE:DOS:COM
    EXECUTABLE:UNIX:SHELL EXECUTABLE:UNIX:ELF EXECUTABLE:DOS:COM
    EXECUTABLE:AMIGAOS:EXECUTABLE DATABASE:ANY:ACCESS
    DATABASE:ANY:MYSQL