I do not know if there has been developpement concerning special characters typing in Windows with the last versions but I remember how it was difficult and needed to be set up differently in each software. In Linux, life is made much more easy as one only needs to set up a “Compose” key in the OS settings to start composing characters in an intuitive way.
First in settings, keyboard, shortcuts, typing: choose a compose key:
Then, in any software just compose the characters you need :
Mesopotamian languages characters
<Multi_key> <c> <S> : “Š” U0160 # LATIN CAPITAL LETTER S WITH CARON
<Multi_key> <less> <S> : “Š” U0160 # LATIN CAPITAL LETTER S WITH CARON
<Multi_key> <S> <less> : “Š” U0160 # LATIN CAPITAL LETTER S WITH CARON
<dead_caron> <s> : “š” U0161 # LATIN SMALL LETTER S WITH CARON
<Multi_key> <c> <s> : “š” U0161 # LATIN SMALL LETTER S WITH CARON
<Multi_key> <less> <s> : “š” U0161 # LATIN SMALL LETTER S WITH CARON
<Multi_key> <s> <less> : “š” U0161 # LATIN SMALL LETTER S WITH CARON
<dead_macron> <U> : “Ū” U016A # LATIN CAPITAL LETTER U WITH MACRON
<Multi_key> <macron> <U> : “Ū” U016A # LATIN CAPITAL LETTER U WITH MACRON
<Multi_key> <underscore> <U> : “Ū” U016A # LATIN CAPITAL LETTER U WITH MACRON
<Multi_key> <U> <underscore> : “Ū” U016A # LATIN CAPITAL LETTER U WITH MACRON
<Multi_key> <minus> <U> : “Ū” U016A # LATIN CAPITAL LETTER U WITH MACRON
<Multi_key> <U> <minus> : “Ū” U016A # LATIN CAPITAL LETTER U WITH MACRON
<dead_macron> <u> : “ū” U016B # LATIN SMALL LETTER U WITH MACRON
<Multi_key> <macron> <u> : “ū” U016B # LATIN SMALL LETTER U WITH MACRON
<Multi_key> <underscore> <u> : “ū” U016B # LATIN SMALL LETTER U WITH MACRON
<Multi_key> <u> <underscore> : “ū” U016B # LATIN SMALL LETTER U WITH MACRON
<Multi_key> <minus> <u> : “ū” U016B # LATIN SMALL LETTER U WITH MACRON
<Multi_key> <u> <minus> : “ū” U016B # LATIN SMALL LETTER U WITH MACRON
<dead_acute> <S> : “Ś” U015A # LATIN CAPITAL LETTER S WITH ACUTE
<Multi_key> <acute> <S> : “Ś” U015A # LATIN CAPITAL LETTER S WITH ACUTE
<Multi_key> <apostrophe> <S> : “Ś” U015A # LATIN CAPITAL LETTER S WITH ACUTE
<Multi_key> <S> <apostrophe> : “Ś” U015A # LATIN CAPITAL LETTER S WITH ACUTE
<dead_acute> <s> : “ś” U015B # LATIN SMALL LETTER S WITH ACUTE
<Multi_key> <acute> <s> : “ś” U015B # LATIN SMALL LETTER S WITH ACUTE
<Multi_key> <apostrophe> <s> : “ś” U015B # LATIN SMALL LETTER S WITH ACUTE
<Multi_key> <s> <apostrophe> : “ś” U015B # LATIN SMALL LETTER S WITH ACUTE
<Multi_key> <N> <G> : “Ŋ” U014A # LATIN CAPITAL LETTER ENG
<Multi_key> <n> <g> : “ŋ” U014B # LATIN SMALL LETTER ENG
<dead_macron> <A> : “Ā” U0100 # LATIN CAPITAL LETTER A WITH MACRON
<Multi_key> <macron> <A> : “Ā” U0100 # LATIN CAPITAL LETTER A WITH MACRON
<Multi_key> <underscore> <A> : “Ā” U0100 # LATIN CAPITAL LETTER A WITH MACRON
<Multi_key> <A> <underscore> : “Ā” U0100 # LATIN CAPITAL LETTER A WITH MACRON
<Multi_key> <minus> <A> : “Ā” U0100 # LATIN CAPITAL LETTER A WITH MACRON
<Multi_key> <A> <minus> : “Ā” U0100 # LATIN CAPITAL LETTER A WITH MACRON
<dead_macron> <a> : “ā” U0101 # LATIN SMALL LETTER A WITH MACRON
<Multi_key> <macron> <a> : “ā” U0101 # LATIN SMALL LETTER A WITH MACRON
<Multi_key> <underscore> <a> : “ā” U0101 # LATIN SMALL LETTER A WITH MACRON
<Multi_key> <a> <underscore> : “ā” U0101 # LATIN SMALL LETTER A WITH MACRON
<Multi_key> <minus> <a> : “ā” U0101 # LATIN SMALL LETTER A WITH MACRON
<Multi_key> <a> <minus> : “ā” U0101 # LATIN SMALL LETTER A WITH MACRON
<dead_macron> <E> : “Ē” U0112 # LATIN CAPITAL LETTER E WITH MACRON
<Multi_key> <macron> <E> : “Ē” U0112 # LATIN CAPITAL LETTER E WITH MACRON
<Multi_key> <underscore> <E> : “Ē” U0112 # LATIN CAPITAL LETTER E WITH MACRON
<Multi_key> <E> <underscore> : “Ē” U0112 # LATIN CAPITAL LETTER E WITH MACRON
<Multi_key> <minus> <E> : “Ē” U0112 # LATIN CAPITAL LETTER E WITH MACRON
<Multi_key> <E> <minus> : “Ē” U0112 # LATIN CAPITAL LETTER E WITH MACRON
<dead_macron> <e> : “ē” U0113 # LATIN SMALL LETTER E WITH MACRON
<Multi_key> <macron> <e> : “ē” U0113 # LATIN SMALL LETTER E WITH MACRON
<Multi_key> <underscore> <e> : “ē” U0113 # LATIN SMALL LETTER E WITH MACRON
<Multi_key> <e> <underscore> : “ē” U0113 # LATIN SMALL LETTER E WITH MACRON
<Multi_key> <minus> <e> : “ē” U0113 # LATIN SMALL LETTER E WITH MACRON
<Multi_key> <e> <minus> : “ē” U0113 # LATIN SMALL LETTER E WITH MACRON
<dead_macron> <I> : “Ī” U012A # LATIN CAPITAL LETTER I WITH MACRON
<Multi_key> <macron> <I> : “Ī” U012A # LATIN CAPITAL LETTER I WITH MACRON
<Multi_key> <underscore> <I> : “Ī” U012A # LATIN CAPITAL LETTER I WITH MACRON
<Multi_key> <I> <underscore> : “Ī” U012A # LATIN CAPITAL LETTER I WITH MACRON
<Multi_key> <minus> <I> : “Ī” U012A # LATIN CAPITAL LETTER I WITH MACRON
<Multi_key> <I> <minus> : “Ī” U012A # LATIN CAPITAL LETTER I WITH MACRON
<dead_macron> <i> : “ī” U012B # LATIN SMALL LETTER I WITH MACRON
<Multi_key> <macron> <i> : “ī” U012B # LATIN SMALL LETTER I WITH MACRON
<Multi_key> <underscore> <i> : “ī” U012B # LATIN SMALL LETTER I WITH MACRON
<Multi_key> <i> <underscore> : “ī” U012B # LATIN SMALL LETTER I WITH MACRON
<Multi_key> <minus> <i> : “ī” U012B # LATIN SMALL LETTER I WITH MACRON
<Multi_key> <i> <minus> : “ī” U012B # LATIN SMALL LETTER I WITH MACRON
<dead_belowdot> <T> : “Ṭ” U1E6C # LATIN CAPITAL LETTER T WITH DOT BELOW
<Multi_key> <exclam> <T> : “Ṭ” U1E6C # LATIN CAPITAL LETTER T WITH DOT BELOW
<dead_belowdot> <t> : “ṭ” U1E6D # LATIN SMALL LETTER T WITH DOT BELOW
<Multi_key> <exclam> <t> : “ṭ” U1E6D # LATIN SMALL LETTER T WITH DOT BELOW
<dead_belowdot> <S> : “Ṣ” U1E62 # LATIN CAPITAL LETTER S WITH DOT BELOW
<Multi_key> <exclam> <S> : “Ṣ” U1E62 # LATIN CAPITAL LETTER S WITH DOT BELOW
<dead_belowdot> <s> : “ṣ” U1E63 # LATIN SMALL LETTER S WITH DOT BELOW
<Multi_key> <exclam> <s> : “ṣ” U1E63 # LATIN SMALL LETTER S WITH DOT BELOW
Typographic characters
<Multi_key> <less> <quotedbl> : ““” U201c # LEFT DOUBLE QUOTATION MARK
<Multi_key> <quotedbl> <less> : ““” U201c # LEFT DOUBLE QUOTATION MARK
<Multi_key> <greater> <quotedbl> : “”” U201d # RIGHT DOUBLE QUOTATION MARK
<Multi_key> <quotedbl> <greater> : “”” U201d # RIGHT DOUBLE QUOTATION MARK
<Multi_key> <comma> <quotedbl> : “„” U201e # DOUBLE LOW-9 QUOTATION MARK
<Multi_key> <quotedbl> <comma> : “„” U201e # DOUBLE LOW-9 QUOTATION MARK
<Multi_key> <minus> <minus> <period> : “–” U2013 # EN DASH
<Multi_key> <minus> <minus> <minus> : “—” U2014 # EM DASH
Find a full list here :
https://cgit.freedesktop.org/xorg/lib/libX11/plain/nls/en_US.UTF-8/Compose.pre