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I always forget where to find this, so here's a copy. It's an old-but-still-useful thing from the Apple Developer documentation archive, and it's from 2005 (whoa, right?)
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Uniform Type Identifiers (UTI).md

What's a Uniform Type Identifier?

Each UTI provides a unique identifier for a particular file type, data type, directory or bundle type, and so on. In addition, other type identifier namespaces for a particular type can be grouped under one UTI, with utility functions available to translate from one format to another.

What's the table below?

The following tables list uniform type identifiers (UTIs) that are declared by the system as of OS X v10.4. [Which was released in 2005. That means it's NOT up to date. Apple Developer stuff has the up to date docs. Still, these can be useful for scripting, Alfred Workflows, and so on.]

Note: These tables list only UTIs declared by the system. Other UTIs may be declared privately by Apple applications (Mail, for example) and third-party developers.

Table 1  System-defined uniform type identifiers

Identifier (Constant)

Conforms to

Tags

Comments

public.item (kUTTypeItem)

-

Base type for the physical hierarchy.

public.content (kUTTypeContent)

-

Base type for all document content.

public.composite-content (kUTTypeCompositeContent)

public.content

Base type for mixed content. For example, a PDF file contains both text and special formatting data.

public.data (kUTTypeData)

public.item

Base physical type for byte streams (flat files, pasteboard data, and so on).

public.database

-

Base functional type for databases.

public.calendar-event

-

Base functional type for scheduled events.

public.message (kUTTypeMessage)

-

Base type for messages (email, IM, and so on).

public.presentation

public.composite-content

Base type for presentations.

public.contact (kUTTypeContact)

-

Base type for contact information.

public.archive (kUTTypeArchive)

-

Base type for an archive of files and directories.

public.disk-image (kUTTypeDiskImage)

public.archive

Base type for items mountable as a volume.

public.text (kUTTypeText)

public.content, public.data

Base type for all text, including text with markup information (HTML, RTF, and so on).

public.plain-text (kUTTypePlainText)

public.text

.txt, text/plain

Text of unspecified encoding, with no markup. Equivalent to the MIME type text/plain

public.utf8-plain-text (kUTTypeUTF8PlainText)

public.plain-text

'utf8', NSStringPBoardType

Unicode-8

public.utf16-external-plain-​text (kUTTypeUTF16ExternalPlain​Text)

public.plain-text

'ut16'

Unicode-16 with byte-order mark (BOM), or if BOM is not present, an external representation byte order (big-endian).

public.utf16-plain-text (kUTTypeUTF16PlainText)

public.plain-text

'utxt'

Unicode-16, native byte order, with an optional byte-order mark (BOM).

com.apple.traditional-mac-​plain-text

public.plain-text

'TEXT'

Classic Mac OS text.

public.rtf (kUTTypeRTF)

public.text

'RTF ', .rtf, text/rtf, NeXT Rich Text Format 1.0 pasteboard type, NSRTFPBoardType

Rich Text.

com.apple.ink.inktext (kUTTypeInkText)

public.data

Opaque InkText data.

public.html (kUTTypeHTML)

public.text

'HTML', .html, .htm, text/html, Apple HTML pasteboard type

HTML text.

public.xml (kUTTypeXML)

public.text

.xml, text/xml

XML text.

public.source-code (kUTTypeSourceCode)

public.plain-text

Generic source code.

public.c-source (kUTTypeCSource)

public.source-code

.c

C source code.

public.objective-c-source (kUTTypeObjectiveCSource)

public.source-code

.m

Objective-C source code.

public.c-plus-plus-source (kUTTypeCPlusPlusSource)

public.source-code

.cp, .cpp, .c++, .cc, .cxx

C++ source code.

public.objective-c-plus-​plus-source (kUTTypeObjectiveC​PlusPlusSource)

public.source-code

.mm

Objective-C++ source code.

public.c-header (kUTTypeCHeader)

public.source-code

.h

C header file.

public.c-plus-plus-header (kUTTypeCPlusPlusHeader)

public.source-code

.hpp, .h++ , .hxx

C++ header file.

com.sun.java-source (kUTTypeJavaSource)

public.source-code

.java, .jav

Java source code

public.script

public.source-code

Base type for scripting language source code.

public.assembly-source

public.source-code

.s

Assembly language source code.

com.apple.rez-source

public.source-code

.r

Rez source code.

public.mig-source

public.source-code

.defs, .mig

Mig definition source code.

com.apple.symbol-export

public.source-code

.exp

Symbol export list.

com.netscape.javascript-​source

public.source-code, public.executable

.js, .jscript, .javascript, text/javascript

JavaScript.

public.shell-script

public.script

.sh, .command

Shell script.

public.csh-script

public.shell-script

.csh

C-shell script.

public.perl-script

public.shell-script

.pl, .pm, text/x-perl-script

Perl script.

public.python-script

public.shell-script

.py, text/x-python-script

Python script.

public.ruby-script

public.shell-script

.rb, .rbw, text/ruby-script

Ruby script.

public.php-script

public.shell-script

.php, .php3, .php4, .ph3, .ph4, .phtml, text/x-php-script, text/php, application/php

PHP script.

com.sun.java-web-start

public.xml

.jnlp, application/x-java, jnlp-file, application/jnlp

Java web start.

com.apple.applescript.text

public.script

.applescript

AppleScript text.

com.apple.applescript.​script

public.data

.scpt, 'osas'

AppleScript.

public.object-code

public.data, public.executable

.o

Object code.

com.apple.mach-o-binary

public.data, public.executable

Mach-O binary.

com.apple.pef-binary

public.data, public.executable

PEF (CFM-based) binary

com.microsoft.windows-​executable

public.data, public.executable

.exe, application/x-msdownload

Microsoft Windows application.

com.microsoft.windows-​dynamic-link-library

public.data, public.executable

.dll, application/x-msdownload

Microsoft dynamic link library.

com.sun.java-class

public.data, public.executable

.class

Java class.

com.sun.java-archive

public.data, public.executable, public.archive

.jar , application/java-archive

Java archive.

com.apple.quartz-​composer-composition

public.data, public.executable

.qtz , application/x-quartzcomposer

Quartz Composer composition.

org.gnu.gnu-tar-archive

public.data, public.archive

.gtar, application/x-gtar

GNU archive.

public.tar-archive

org.gnu.gnu-tar-archive

.tar, application/x-tar, application/tar

Tar archive.

org.gnu.gnu-zip-archive

public.data, public.archive

.gz, .gzip, application/x-gzip, application/gzip

Gzip archive.

org.gnu.gnu-zip-tar-archive

org.gnu.gnu-zip-archve

.tgz

Gzip tar archive.

com.apple.binhex-archive

public.data, public.archive

.hqx, application/mac-binhex40, application/mac-binhex, application/binhex

BinHex archive.

com.apple.macbinary-​archive

public.data, public.archive

.bin, application/x-macbinary, application/macbinary

MacBinary archive.

public.url (kUTTypeURL)

public.data

'url '

Uniform Resource Locator.

public.file-url (kUTTypeFileURL)

public.url

'furl'

File URL.

public.url-name

-

'urln'

URL name.

public.vcard (kUTTypeVCard)

public.data, public.content

'vCrd', .vcf, .vcard, text/directory, text/vcard, text/x-vcard, Apple Vcard, pasteboard type

vCard (electronic business card).

public.image (kUTTypeImage)

public.data, public.content

Base type for images.

public.fax

public.image

Base type for fax images.

public.jpeg (kUTTypeJPEG)

public.image

'JPEG', .jpg, .jpeg, image/jpeg

JPEG image.

public.jpeg-2000 (kUTTypeJPEG2000)

public.image

'jp2 ', .jp2, image/jp2

JPEG 2000 image.

public.tiff (kUTTypeTIFF)

public.image

'TIFF', .tif, .tiff, image/tiff, NeXT TIFF v4.0 pasteboard type, NSTIFFPBoardType

TIFF image.

public.camera-raw-image

public.image

Base type for digital camera raw image formats.

com.apple.pict (kUTTypePICT)

public.image

'PICT', .pic, .pct, .pict, image/pict, image/x-pict, image/x-macpict

PICT image

com.apple.macpaint-image

public.image

.pntg, 'PNTG'

MacPaint image.

public.png (kUTTypePNG)

public.image

'PNGf', .png, image/png

PNG image

public.xbitmap-image

public.image

.xbm, image/x-quicktime

X bitmap image.

com.apple.quicktime-image (kUTTypeQuickTimeImage)

public.image

'qtif', .qif, .qtif, image/x-quicktime

QuickTime image.

com.apple.icns (kUTTypeAppleICNS)

public.image

'icns', .icns

Mac OS icon image.

com.apple.txn.text-​multimedia-data (kUTTypeTXNTextAnd​MultimediaData)

public.data, public.composite-​content

'txtn'

MLTE (Textension) format for mixed text and multimedia data.

public.audiovisual-​content (kUTTypeAudioVisual​Content)

public.data, public.content

Base type for any audiovisual content.

public.movie

public.audiovisual-​content

Base type for movies (video with optional audio or other tracks).

public.video (kUTTypeVideo)

public.movie

Base type for video (no audio).

com.apple.quicktime-movie (kUTTypeQuickTimeMovie)

public.movie

'MooV', .mov, .qt, video/quicktime

QuickTime movie.

public.avi

public.movie

.avi, .vfw, 'Vfw ', video/avi, video/msvideo, video/x-msvideo

AVI movie.

public.mpeg (kUTTypeMPEG)

public.movie

'MPG ', 'MPEG', .mpg, .mpeg, .m75, .m15, video/mpg, video/mpeg, video/x-mpg, video/x-mpeg

MPEG-1 or MPEG-2 content.

public.mpeg-4 (kUTTypeMPEG4)

public.movie

'mpg4', .mp4, video/mp4, video/mp4v

MPEG-4 content.

public.3gpp

public.movie

.3gp, .3gpp, '3gpp', video/3gpp, audio/3gpp

3GPP movie.

public.3gpp2

public.movie

.3g2 , .3gp2 , '3gp2', video/3gpp2, audio/3gpp2

3GPP2 movie.

public.audio (kUTTypeAudio)

public.audiovisual-​content

Base type for audio (no video).

public.mp3 (kUTTypeMP3)

public.audio

'MPG3', 'mpg3', 'Mp3 ', 'MP3 ', 'mp3!', 'MP3!', .mp3, audio/mpeg, audio/mpeg3, audio/mpg, audio/mp3, audio/x-mpeg, audio/x-mpeg3, audio/x-mpg, audio/x-mp3

MPEG-3 audio.

public.mpeg-4-audio (kUTTypeMPEG4Audio)

public.audio, public.mpeg4

'M4A ', .m4a

MPEG-4 audio.

com.apple.protected-​mpeg-4-audio (kUTTypeAppleProtected​MPEG4Audio)

public.audio

'M4P ', 'M4B ', .m4p, .m4b

Protected MPEG-4 audio. (iTunes music store format)

public.ulaw-audio

public.audio

.au, .ulw, .snd, 'ULAW', audio/basic, audio/au, audio/snd

μLaw audio.

public.aifc-audio

public.audio

.aifc, .aiff, .aif, 'AIFC', audio/aiff, audio/x-aiff

AIFF-C audio.

public.aiff-audio

public.audio

.aiff, .aif, 'AIFF', audio/aiff, audio/x-aiff

AIFF audio.

com.apple.coreaudio-​format

public.audio

.caf, 'caff'

Core Audio format.

public.directory (kUTTypeDirectory)

public.item

Base type for directories.

public.folder (kUTTypeFolder)

public.directory

A plain folder (that is, not a package).

public.volume (kUTTypeVolume)

public.folder

A volume.

com.apple.package (kUTTypePackage)

public.directory

A package (that is, a directory presented to the user as a file).

com.apple.bundle (kUTTypeBundle)

public.directory

'BNDL', .bundle

A directory with an internal structure specified by Core Foundation Bundle Services. .

public.executable

-

Base type for executable data.

com.apple.application (kUTTypeApplication)

public.executable

Base type for applications and other launchable files.

com.apple.application-​bundle (kUTTypeApplicationBundle)

com.apple.package, com.apple.bundle, com.apple.application

'APPL', .app

Application bundle.

com.apple.application-file (kUTTypeApplicationFile)

com.apple.application public.data

'APPL'

Application file.

com.apple.deprecated-​application-file

com.apple.application​-file

'APPC', 'APPD', 'APPE', 'appe', 'CDEV', 'cdev', 'dfil'

Deprecated application file.

com.apple.plugin

com.apple.bundle, com.apple.package

.plugin

Plugin.

com.apple.metadata-​importer

com.apple.plugin

.mdimporter

Spotlight importer plugin.

com.apple.dashboard-​widget

com.apple.bundle, com.apple.package

.wdgt

Dashboard widget.

public.cpio-archive

public.data

.cpio

CPIO archive.

com.pkware.zip-archive

public.data, public.archive

.zip, application/zip

Zip archive.

com.apple.webarchive (kUTTypeWebArchive)

public.data, public.composite-​content

Web Kit webarchive format.

com.apple.framework (kUTTypeFramework)

com.apple.bundle

'FMWK', .framework

Framework.

com.apple.rtfd (kUTTypeRTFD)

com.apple.package, public.composite-​content

.rtfd

Rich Text Format Directory. That is, Rich Text with content embedding, on-disk format.

com.apple.flat-rtfd (kUTTypeFlatRTFD)

public.data, public.composite-​content

NeXT RTFD pasteboard type, NSRTFDPBoardType

Rich Text with content embedding, pasteboard format.

com.apple.resolvable (kUTTypeResolvable)

-

Items that the Alias Manager can resolve.

public.symlink (kUTTypeSymLink)

public.item, com.apple.resolvable

UNIX-style symlink.

com.apple.mount-point (kUTTypeMountPoint)

public.item, com.apple.resolvable

A volume mount point

com.apple.alias-record (kUTTypeAliasRecord)

public.data, com.apple.resolvable

'alis'

Alias record.

com.apple.alias-file (kUTTypeAliasFile)

public.data, com.apple.resolvable

Alias file.

public.font

public.data

Base type for fonts.

public.truetype-font

public.font

TrueType font.

com.adobe.postscript-font

public.font

PostScript font.

com.apple.truetype-​datafork-suitcase-font

public.truetype-font

.dfont, 'dfon'

TrueType data fork font.

public.opentype-font

public.font

.otf, 'OTTO'

PostScript OpenType font.

public.truetype-ttf-font

public.truetype-font

.ttf

TrueType OpenType font.

public.truetype-collection-​font

public.font

.ttc, 'ttcf'

TrueType collection font.

com.apple.font-suitcase

public.font

.suit, 'FFIL', 'ffil', 'sfnt', 'tfil'

Font suitcase.

com.adobe.postscript-lwfn​-font

com.adobe.postscript-​font

'LWFN'

PostScript Type 1 outline font.

com.adobe.postscript-pfb-​font

com.adobe.postscript-​font

.pfb

PostScriptType1 outline font.

com.adobe.postscript.pfa-​font

com.adobe.postscript-​font

.pfa

PostScriptType 1 outline font.

com.apple.colorsync-profile

public.data

.icc, .icm, .pf , 'prof'

ColorSync profile.

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