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Appendix C. Verified MIME filetypes
Some NetDefendOS Application Layer Gateways (ALGs) have the optional ability to verify that the
contents of a downloaded file matches the type that the filetype in the filename indicates. The
filetypes for which MIME verification can be done are listed in this appendix and the ALGs to
which this applies are:
• The HTTP ALG
• The FTP ALG
• The POP3 ALG
• The SMTP ALG
The ALGs listed above also offer the option to explicitly allow or block certain filetypes as
downloads from a list of types. That list is the same one found in this appendix.
For a more detailed description of MIME verification and the filetype block/allow feature, see
Section 6.2.2, “The HTTP ALG”.
Filetype extension Application
3ds 3d Studio files
3gp 3GPP multimedia file
aac MPEG-2 Advanced Audio Coding File
ab Applix Builder
ace ACE archive
ad3 Dec systems compressed Voice File
ag Applix Graphic file
aiff, aif Audio Interchange file
am Applix SHELF Macro
arc Archive file
alz ALZip compressed file
avi Audio Video Interleave file
arj Compressed archive
ark QuArk compressed file archive
arq Compressed archive
as Applix Spreadsheet file
asf Advanced Streaming Format file
avr Audio Visual Research Sound
aw Applix Word file
bh Blackhole archive format file
bmp Windows Bitmap Graphics
box VBOX voice message file
bsa BSARC Compressed archive
bz, bz2 Bzip UNIX compressed file
cab Microsoft Cabinet file
cdr Corel Vector Graphic Drawing file
cgm Computer Graphics Metafile
chz ChArc compressed file archive
class Java byte code
cmf Creative Music file
core/coredump Unix core dump
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