--- a/runtime/syntax/desktop.vim
+++ b/runtime/syntax/desktop.vim
@@ -1,107 +1,267 @@
 " Vim syntax file
-" Language:	.desktop, .directory files
-"		according to freedesktop.org specification 0.9.4
-" http://pdx.freedesktop.org/Standards/desktop-entry-spec/desktop-entry-spec-0.9.4.html
-" Maintainer:	Mikolaj Machowski ( mikmach AT wp DOT pl )
-" Last Change:	2016 Apr 02
-" 		(added "Keywords")
-" Version Info: desktop.vim 0.9.4-1.2
+" Language: XDG desktop entry
+" Filenames: *.desktop, *.directory
+" Maintainer: Eisuke Kawashima ( e.kawaschima+vim AT gmail.com )
+" Previous Maintainer: Mikolaj Machowski ( mikmach AT wp DOT pl )
+" Last Change: 2020-06-11
+" Version Info: desktop.vim 1.5
+" References:
+" - https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-1.5.html (2020-04-27)
+" - https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-0.11.html (2006-02-07)
 
 " quit when a syntax file was already loaded
 if exists("b:current_syntax")
-    finish
+  finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+syn case match
+
+" Variable {{{1
+" This syntax file can be used to all *nix configuration files similar to dos
+" ini format (eg. .xawtv, .radio, kde rc files) - this is default mode.
+" By default strict following of freedesktop.org standard is enforced.
+" To highlight nonstandard extensions that does not begin with X-, set
+"   let g:desktop_enable_nonstd = v:true
+" Note that this may cause wrong highlight.
+" To highlight KDE-reserved features, set
+"   let g:desktop_enable_kde = v:true
+" g:desktop_enable_kde follows g:desktop_enable_nonstd if not supplied
+
+if exists("g:desktop_enable_nonstd") && g:desktop_enable_nonstd
+  let s:desktop_enable_nonstd = v:true
+else
+  let s:desktop_enable_nonstd = v:false
+endif
+
+if exists("g:desktop_enable_kde") && g:desktop_enable_kde || s:desktop_enable_nonstd
+  let s:desktop_enable_kde = v:true
+else
+  let s:desktop_enable_kde = v:false
 endif
 
-" This syntax file can be used to all *nix configuration files similar to dos
-" ini format (eg. .xawtv, .radio, kde rc files) - this is default mode. But
-" you can also enforce strict following of freedesktop.org standard for
-" .desktop and .directory files . Set (eg. in vimrc)
-" let enforce_freedesktop_standard = 1
-" and nonstandard extensions not following X- notation will not be highlighted.
-if exists("enforce_freedesktop_standard")
-	let b:enforce_freedesktop_standard = 1
-else
-	let b:enforce_freedesktop_standard = 0
+" Comment {{{1
+syn match dtComment /^#.*$/
+
+" Error {{{1
+syn match dtError /\%(^\s.*\|\s\+$\)/
+
+" Group Header {{{1
+" ASCII printable characters except for brackets [ (0x5B) and ] (0x5D)
+syn match dtGroup /^\[[\x20-\x5A\x5C\x5E-\x7E]\+\]$/
+
+" Entries {{{1
+syn match dtDelim /=/ contained
+" lang_territory.codeset@modifier
+syn match dtLocaleSuffix
+      \ /\[\%(C\|POSIX\|[a-z]\{2,4}\%(_[A-Z0-9]\{2,3}\)\?\)\%(\.[A-Za-z0-9_-]\+\)\?\%(@[A-Za-z]\+\)\?\]\ze\s*=/
+      \ contained
+
+" Boolean Value {{{2
+syn match   dtBoolean
+      \ /^\%(DBusActivatable\|Hidden\|NoDisplay\|PrefersNonDefaultGPU\|StartupNotify\|Terminal\)\s*=\s*\%(true\|false\)/
+      \ contains=dtBooleanKey,dtDelim,dtBooleanValue transparent
+syn keyword dtBooleanKey
+      \ DBusActivatable Hidden NoDisplay PrefersNonDefaultGPU StartupNotify Terminal
+      \ contained nextgroup=dtDelim
+
+if s:desktop_enable_kde
+  syn match   dtBoolean
+        \ /^ReadOnly\s*=\s*\%(true\|false\)/
+        \ contains=dtBooleanKey,dtDelim,dtBooleanValue transparent
+  syn keyword dtBooleanKey
+        \ ReadOnly
+        \ contained nextgroup=dtDelim
+endif
+syn keyword dtBooleanValue true false contained
+
+" Numeric Value {{{2
+" icon theme
+syn match   dtNumeric /^\%(MaxSize\|MinSize\|Size\|Threshold\)\s*=\s*\d\+/ contains=dtNumericKey,dtDelim,dtNumericDecimal
+syn keyword dtNumericKey
+      \ MaxSize MinSize Size Threshold
+      \ contained nextgroup=dtDelim
+
+if s:desktop_enable_kde
+  syn match   dtNumeric /^InitialPreference\s*=\s*\d\+/ contains=dtNumericKey,dtDelim,dtNumericDecimal
+  syn keyword dtNumericKey
+        \ InitialPreference
+        \ contained nextgroup=dtDelim
 endif
 
-" case on
-syn case match
+syn match   dtNumericDecimal /\<\d\+$/ contained
+
+" String Value {{{2
+syn match   dtString
+      \ /^\%(Actions\|Implements\|MimeType\|NotShowIn\|OnlyShowIn\|Path\|StartupWMClass\|URL\)\s*=.*\S/
+      \ contains=dtStringKey,dtDelim transparent
+syn keyword dtStringKey
+      \ Actions Implements MimeType NotShowIn OnlyShowIn Path StartupWMClass URL Version
+      \ contained nextgroup=dtDelim
 
-" General
-if b:enforce_freedesktop_standard == 0
-	syn match  dtNotStLabel	"^.\{-}=\@=" nextgroup=dtDelim
+" icon theme
+syn match   dtString
+      \ /^\%(Context\|Directories\|Example\|Inherits\)\s*=.*\S/
+      \ contains=dtStringKey,dtDelim transparent
+syn keyword dtStringKey
+      \ Context Directories Example Inherits
+      \ contained nextgroup=dtDelim
+
+if s:desktop_enable_kde
+  syn match   dtString
+        \ /^\%(Dev\|DocPath\|FSType\|MountPoint\|ServiceTypes\)\s*=.*\S/
+        \ contains=dtStringKey,dtDelim transparent
+  syn keyword dtStringKey
+        \ Dev DocPath FSType MountPoint ServiceTypes
+        \ contained nextgroup=dtDelim
 endif
 
-syn match  dtGroup	/^\s*\[.*\]/
-syn match  dtComment	/^\s*#.*$/
-syn match  dtDelim	/=/ contained
-
-" Locale
-syn match   dtLocale /^\s*\<\(Name\|GenericName\|Comment\|SwallowTitle\|Icon\|UnmountIcon\)\>.*/ contains=dtLocaleKey,dtLocaleName,dtDelim transparent
-syn keyword dtLocaleKey Name GenericName Comment SwallowTitle Icon UnmountIcon nextgroup=dtLocaleName containedin=dtLocale
-syn match   dtLocaleName /\(\[.\{-}\]\s*=\@=\|\)/ nextgroup=dtDelim containedin=dtLocale contained
+" Categories {{{3
+" https://specifications.freedesktop.org/menu-spec/menu-spec-1.0.html#category-registry
+syn match   dtCategories /^Categories\s*=.\+\S/ contains=dtCategoriesKey,dtDelim,dtCategoriesValue transparent
+syn keyword dtCategoriesKey
+      \ Categories
+      \ contained nextgroup=dtDelim
 
-" Numeric
-syn match   dtNumeric /^\s*\<Version\>/ contains=dtNumericKey,dtDelim
-syn keyword dtNumericKey Version nextgroup=dtDelim containedin=dtNumeric contained
-
-" Boolean
-syn match   dtBoolean /^\s*\<\(StartupNotify\|ReadOnly\|Terminal\|Hidden\|NoDisplay\)\>.*/ contains=dtBooleanKey,dtDelim,dtBooleanValue transparent
-syn keyword dtBooleanKey StartupNotify ReadOnly Terminal Hidden NoDisplay nextgroup=dtDelim containedin=dtBoolean contained
-syn keyword dtBooleanValue true false containedin=dtBoolean contained
+" Main Categories
+syn keyword dtCategoriesValue
+      \ Audio AudioVideo Development Education Game Graphics Network Office
+      \ Settings System Utility Video
+      \ contained
 
-" String
-syn match   dtString /^\s*\<\(Encoding\|Icon\|Path\|Actions\|FSType\|MountPoint\|UnmountIcon\|URL\|Keywords\|Categories\|OnlyShowIn\|NotShowIn\|StartupWMClass\|FilePattern\|MimeType\)\>.*/ contains=dtStringKey,dtDelim transparent
-syn keyword dtStringKey Type Encoding TryExec Exec Path Actions FSType MountPoint URL Keywords Categories OnlyShowIn NotShowIn StartupWMClass FilePattern MimeType nextgroup=dtDelim containedin=dtString contained
-
-" Exec
-syn match   dtExec /^\s*\<\(Exec\|TryExec\|SwallowExec\)\>.*/ contains=dtExecKey,dtDelim,dtExecParam transparent
-syn keyword dtExecKey Exec TryExec SwallowExec nextgroup=dtDelim containedin=dtExec contained
-syn match   dtExecParam  /%[fFuUnNdDickv]/ containedin=dtExec contained
+" Additional Categories
+syn keyword dtCategoriesValue
+      \ BoardGame Chat Clock Geoscience Presentation 2DGraphics 3DGraphics
+      \ Accessibility ActionGame AdventureGame Amusement ArcadeGame Archiving
+      \ Art ArtificialIntelligence Astronomy AudioVideoEditing Biology
+      \ BlocksGame BoardGame Building Calculator Calendar CardGame Chart Chat
+      \ Chemistry Clock Compression ComputerScience ConsoleOnly Construction
+      \ ContactManagement Core DataVisualization Database Debugger
+      \ DesktopSettings Dialup Dictionary DiscBurning Documentation Economy
+      \ Electricity Electronics Email Emulator Engineering FileManager
+      \ FileTools FileTransfer Filesystem Finance FlowChart GNOME GTK
+      \ GUIDesigner Geography Geology Geoscience HamRadio HardwareSettings
+      \ History IDE IRCClient ImageProcessing InstantMessaging Java KDE
+      \ KidsGame Languages Literature LogicGame Math MedicalSoftware Midi
+      \ Mixer Monitor Motif Music News NumericalAnalysis OCR P2P PDA
+      \ PackageManager ParallelComputing Photography Physics Player
+      \ Presentation Printing Profiling ProjectManagement Publishing Qt
+      \ RasterGraphics Recorder RemoteAccess RevisionControl Robotics
+      \ RolePlaying Scanning Science Security Sequencer Simulation Sports
+      \ SportsGame Spreadsheet StrategyGame TV Telephony TelephonyTools
+      \ TerminalEmulator TextEditor TextTools Translation Tuner VectorGraphics
+      \ VideoConference Viewer WebBrowser WebDevelopment WordProcessor
+      \ contained
 
-" Type
-syn match   dtType /^\s*\<Type\>.*/ contains=dtTypeKey,dtDelim,dtTypeValue transparent
-syn keyword dtTypeKey Type nextgroup=dtDelim containedin=dtType contained
-syn keyword dtTypeValue Application Link FSDevice Directory containedin=dtType contained
+" Reserved Category
+syn keyword dtCategoriesValue
+      \ Applet Screensaver Shell TrayIcon
+      \ contained
+
+" Exec/TryExec {{{3
+syn match   dtExec /^\%(Exec\|TryExec\)\s*=.\+\S/ contains=dtExecKey,dtDelim,dtExecParam transparent
+syn keyword dtExecKey
+      \ Exec TryExec
+      \ contained nextgroup=dtDelim
+" code for file(s), URL(s), etc
+syn match   dtExecParam  /\s\zs%[fFuUick]\ze\%(\W\|$\)/ contained
 
-" X-Addition
-syn match   dtXAdd    /^\s*X-.*/ contains=dtXAddKey,dtDelim transparent
-syn match   dtXAddKey /^\s*X-.\{-}\s*=\@=/ nextgroup=dtDelim containedin=dtXAdd contains=dtXLocale contained
+" Type {{{3
+syn match   dtType /^Type\s*=\s*\S\+/ contains=dtTypeKey,dtDelim,dtTypeValue transparent
+syn keyword dtTypeKey
+      \ Type
+      \ contained nextgroup=dtDelim
+syn keyword dtTypeValue
+      \ Application Directory Link
+      \ contained
 
-" Locale for X-Addition
-syn match   dtXLocale /\[.\{-}\]\s*=\@=/ containedin=dtXAddKey contained
-
-" Locale for all
-syn match   dtALocale /\[.\{-}\]\s*=\@=/ containedin=ALL
+if s:desktop_enable_kde
+  syn keyword dtTypeValue
+        \ FSDevice Service ServiceType
+        \ contained
+endif
 
 
-" Define the default highlighting.
-" Only when an item doesn't have highlighting yet
+" Version {{{3
+syn match   dtVersion /^Version\s*=\s*\S\+/ contains=dtVersionKey,dtDelim,dtVersionValue transparent
+syn keyword dtVersionKey
+      \ Version
+      \ contained nextgroup=dtDelim
+syn match   dtVersionValue /[0-9]\+\%(\.[0-9]\+\)\{1,2}$/ contained
 
-hi def link dtGroup		 Special
-hi def link dtComment	 Comment
-hi def link dtDelim		 String
+" Localestring Value {{{2
+syn match   dtLocalestring
+      \ /^\%(Comment\|GenericName\|Keywords\|Name\)\%(\[.\{-}\]\)\?\s*=.*\S/
+      \ contains=dtLocalestringKey,dtLocaleSuffix,dtDelim transparent
+syn keyword dtLocalestringKey
+      \ Comment GenericName Keywords Name
+      \ contained nextgroup=dtLocaleSuffix,dtDelim skipwhite
 
-hi def link dtLocaleKey	 Type
-hi def link dtLocaleName	 Identifier
-hi def link dtXLocale	 Identifier
-hi def link dtALocale	 Identifier
+" Iconstring Value {{{2
+syn match   dtIconstring
+      \ /^Icon\s*=.*\S/
+      \ contains=dtIconstringKey,dtDelim transparent
+syn keyword dtIconstringKey
+      \ Icon
+      \ contained nextgroup=dtDelim skipwhite
 
-hi def link dtNumericKey	 Type
+if s:desktop_enable_kde
+  syn match   dtIconstring
+        \ /^UnmountIcon\>\%(\[.\{-}\]\)\?\s*=.*\S/
+        \ contains=dtIconstringKey,dtLocaleSuffix,dtDelim transparent
+  syn keyword dtIconstringKey
+        \ UnmountIcon
+        \ contained nextgroup=dtLocaleSuffix,dtDelim skipwhite
+endif
+
+" X-Extension {{{2
+syn match   dtXExtension    /^X-[0-9A-Za-z-]*\%(\[.\{-}\]\)\?\s*=.*\S/
+      \ contains=dtXExtensionKey,dtLocaleSuffix,dtDelim transparent
+syn match   dtXExtensionKey /^X-[0-9A-Za-z-]*/ contained nextgroup=dtLocaleSuffix,dtDelim
 
-hi def link dtBooleanKey	 Type
-hi def link dtBooleanValue	 Constant
+" non standard {{{2
+if s:desktop_enable_nonstd
+  syn match dtNonStdLabel    /^[0-9A-Za-z-]\+\%(\[.\{-}\]\)\?\s*=.*\S/
+        \ contains=dtNonStdLabelKey,dtLocaleSuffix,dtDelim transparent
+  syn match dtNonStdLabelKey /^[0-9A-Za-z-]\+/ contained nextgroup=dtLocaleSuffix,dtDelim
+endif
+
+" Highlight {{{1
+hi def link dtComment		Comment
+hi def link dtError		Error
 
-hi def link dtStringKey	 Type
+hi def link dtGroup		Special
+
+hi def link dtDelim		Delimiter
+hi def link dtLocaleSuffix	Identifier
+
+hi def link dtBooleanKey	Type
+hi def link dtBooleanValue	Boolean
+
+hi def link dtNumericKey	Type
+hi def link dtNumericDecimal	Number
 
-hi def link dtExecKey	 Type
-hi def link dtExecParam	 Special
-hi def link dtTypeKey	 Type
-hi def link dtTypeValue	 Constant
-hi def link dtNotStLabel	 Type
-hi def link dtXAddKey	 Type
+hi def link dtStringKey		Type
+hi def link dtCategoriesKey	Type
+hi def link dtCategoriesValue	Constant
+hi def link dtExecKey		Type
+hi def link dtExecParam		Special
+hi def link dtTypeKey		Type
+hi def link dtTypeValue		Constant
+hi def link dtVersionKey	Type
+hi def link dtVersionValue	Constant
+
+hi def link dtLocalestringKey	Type
 
+hi def link dtIconStringKey	Type
 
+hi def link dtXExtensionKey	Type
+
+hi def link dtNonStdLabelKey	Type
+
+" Clean Up {{{1
 let b:current_syntax = "desktop"
+let &cpo = s:cpo_save
 
-" vim:ts=8
+" vim:ts=8:sw=2:fdm=marker