As this standard is quite old there are some deprecated items that may or may not be used by several implementations.
Type=MimeType is deprecated as there is a
new standard for this now, see the Shared
MIME-info Database specification for more
information. In consequence the Keys
Patterns (various file name extensions
associated with the MIME type) and
DefaultApp (the default application
associated with this MIME type) are also deprecated.
.kdelnk instead of
.desktop as the file extension is
[KDE Desktop Entry] instead of
[Desktop Entry] as header is deprecated.
Encoding key is deprecated. It was used to
specify whether keys of type
encoded in UTF-8 or in the specified locale. Possible values are
Appendix D, The
Legacy-Mixed Encoding (Deprecated) for more details.
Exec field codes:
%m (the mini-icon associated with the
desktop entry, this should be expanded as two arguments,
--miniicon and the content of the
MiniIcon key, it can also be ignored by
expanding it to no arguments) and %v (the device as listed
Dev key in the desktop file).
MiniIcon (small icon for
TerminalOptions (if the
program runs in a terminal, any options that should be
passed to the terminal emulator before actually executing
SwallowExec keys are deprecated.
SwallowTitle key is of type
localestring and specifies the title of the window
if is swallowed onto the panel. The
key is of type
string and specifies the
program to exec if swallowed app is clicked.
SortOrder key is deprecated. It is of type
string(s) and may be used to specify the order in
which to display files. The Desktop
Menu Specification defines another mechanism for defining the
order of menu items.
FilePattern key is deprecated.
The value is a list of regular
expressions to match against for a file manager to determine if this
entry's icon should be displayed. Usually simply the name of the main
executable and friends.
Historically some booleans have been represented by the numeric
this version of the standard they are now to be represented as a
boolean string. However, if an implementation is reading a pre-1.0
desktop entry, it should interpret
Historically lists have been comma separated. This is inconsistent with other lists which are separated by a semicolon. When reading a pre-1.0 desktop entry, comma separated lists should continue to be supported.