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MIME Application Info

MIME Application/octetstream

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An attachment identified as a mime application/octetstream is usually a binary file. As an “application” MIME type, the file is usually associated with an application of some sort such as a data file or a document. The term mime application/octetstream also gives us additional clues with “octetstream” telling us that this file type contains binary data. The term “octetstream” is usually returned when the subtype is unknown or can’t be determined.

Original developed for use with e-mail attachments, MIME types are also used to tell Web browsers what type of content they are dealing with. The first part of the equation is the MIME type, in this case application, and the second part is the MIME subtype, in this case octetstream (or unknown).

If you encounter a message that says mime application/octetstream, the message is telling you that the file could be a .bin file, an .exe file, or something else. Since the e-mail program or Web browser doesn’t know what the file is, you may need to do a little investigative work on your own before opening the file. For example, unsolicited e-mail messages containing the mime application/octetstream type and subtype could contain a malicious file. On the other hand, if the mime application/octetstream message contains an expected file that was sent to you from a business associate, it’s likely harmless.

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MIME Application/bat
MIME Application/bin
MIME Application/binary
MIME Application/binhex
MIME Application/brain-1.5
MIME Application/bzip2
MIME Application/com
MIME Application/d64
MIME Application/dos-exe
MIME Application/dsk
MIME Application/exe
MIME Application/gzip
MIME Application/gzip-compressed
MIME Application/gzipped
MIME Application/ico
MIME Application/java
MIME Application/java-byte-code
MIME Application/java-vm
MIME Application/lha
MIME Application/lzh
MIME Application/mac-binhex
MIME Application/mac-binhex40
MIME Application/macbinary
MIME Application/maclha
MIME Application/msdos-windows
MIME Application/textedit
MIME Application/uue
MIME Application/x-bat
MIME Application/x-bz2
MIME Application/x-bzip
MIME Application/x-class-file
MIME Application/x-com
MIME Application/x-compress
MIME Application/x-compressed
MIME Application/x-d64
MIME Application/x-exe
MIME Application/x-gunzip
MIME Application/x-gzip
MIME Application/x-gzip-compressed
MIME Application/x-ico
MIME Application/x-java
MIME Application/x-java-applet
MIME Application/x-java-bean
MIME Application/x-java-class
MIME Application/x-java-vm
MIME Application/x-jinit-applet
MIME Application/x-jinit-bean
MIME Application/x-lha
MIME Application/x-lzh
MIME Application/x-lzh-archive
MIME Application/x-macbinary
MIME Application/x-msdos-program
MIME Application/x-msdownload
MIME Application/x-patch
MIME Application/x-python
MIME Application/x-redhat packet manager
MIME Application/x-rpm
MIME Application/x-stuffit
MIME Application/x-tar
MIME Application/x-tencore
MIME Application/x-win-bitmap
MIME Application/x-winexe
MIME Application/x-winzip
MIME Application/x-zip
MIME Application/x-zip-compressed
MIME Application/zip

exe, bin, bas, bat, bms, bpm, brn, bz2, class, cmd, com, curv, d64, dat, dba, dll, dms, drv, dsk, dss, ebak, ecr, efa, efi, emap, emc, epm, exe, exf, fbk, fdk, gg, gz, hqx, ico, ilf, iok, iom, ipd, jwr, kip, lce, lha, lib, lpj, lzh, ml3, ml4, ml5, ml6, ml7, ml8, ml9, mla, mls, obj, opos, opt, p2m, pat, patch, pfd, pif, pna, pw, py, rad, root, rpm, sbak, sen, so, spk, spoo, style, tos, tsr, tun, uu, vbx, vsys, xdelta, xpc, xsc, zip

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