WordPerfect 4.1 File Format

A WordPerfect 4.1 file has no header or footer.
There are two types of codes:
Codes between 80h and BFh are single-byte codes.
Codes between C0h and FFh are multi-byte codes, which are usually terminated
with a repetition of the code byte.

The following codes are significant for WordPerfect 4.1 files:

WordPerfect 4.1 Single-Byte Codes
Code	Meaning
09	Tab
0A	Hard newline
0B	Soft new page
0C	Hard new page
0D	Soft newline

80	No-op (always deleted)
81	Right justification on
82	Right justification off
83	End of centred text (see C3)
84	End of aligned/flushed text (see C4)
85	Temporary starting point for math calculations
86	Centre page from top to bottom
87	Begin column mode
88	End column mode
89	Tab after the right margin
8A	Widow/Orphan control on
8B	Widow/Orphan control off
8C	Hard end of line and soft end of page
8D	Footnote number (appears only inside of footnotes)
8E, 8F	Reserved
90	Red line on
91	Red line off
92	Strikeout on
93	Strikeout off
94	Underline on
95	Underline off
96	Reverse video on (reserved)
97	Reverse video off (reserved)
98	Table of contents placeholder
99	Overstrike
9A	Cancel hyphenation of following word
9B	End of generated text
9C	Bold off
9D	Bold on
9E	Hyphenation off
9F	Hyphenation on
A0	Hard space
A1	Do subtotal
A2	Subtotal entry
A3	Do total
A4	Total entry
A5	Do grand total
A6	Math calculation column
A7	Begin math mode
A8	End math mode
A9	Hard hyphen in line
AA	Hard hyphen at end of line
AB	Hard hyphen at end of page
AC	Soft hyphen
AD	Soft hyphen at end of line
AE	Soft hyphen at end of page
AF	End of text columns and end of line
B0	End of text columns and end of page
BC	Superscript
BD	Subscript
BE	Advance printer 1/2 line up
BF	Advance printer 1/2 line down

WordPerfect 4.1 Multi-Byte Codes
Code	Length	Meaning and format
C0	6	Margin Reset <C0><old L><old R><new L><new R><C0>
C1	4	Spacing Reset (uses half-line values)
		<C1><old spacing><new spacing><C1>
C2	3	Left Margin Release <C2><# of spaces to go left><C2>
C3	5	Centre following text <C3><type><centre col #><start col #><C3>
		type: 0 - centre between margins,
		      1 - centre around current column
		End centred text by using code <83>.
C4	5	Align or flush right
		<C4><align char><align col #><start col #><C4>
		If align char = \n, this is a flush right command and the align
		col # is the right margin; otherwise, the align col # is the
		next tab stop.  If the high bit of the align char is set, then
		this is a dot leader align or dot leader flush right.
		End aligned or flushed text by using code <84>.
C5	6	Reset hyphenation zone <C5><old L><old R><new L><new R><C5>
C6	4	Set page # position <C6><old pos code><new pos code><C6>
		Code: 0 - none, 1 - top L, 2 - top centre, 3 - top R,
		4 - top L&R, 5 - bottom L, 6 - bottom centre, 7 - bottom R,
		8 - bottom L&R
C7	6	Set page number
		<C7><old # high ord><old # low ord><new # high ord>
			<new # low ord><C7>
		These are two fifteen-bit numbers.  Setting the high order bit
		selects Roman numerals; otherwise Arabic numbers are used.
C8	8	Set page number colunn positions
		<C8><old L><old centre><old R><new L><new centre><new R><C8>
C9	42	Set tabs <C9><old tab table (20 bytes)>
			<new tab table (20 bytes)><C9>
CA	3	Conditional end of page <CA><# of lines not to be broken><CA>
CB	6	Set pitch/font <CB><old pitch><old font><new pitch><new font>
			<CB>
		Setting pitch to a negative value selects a proportional font.
CC	4	Set temporary margin <CC><old tempmargin><new tempmargin><CC>
CD	3	End of temporary margin <CD><tempmargin><CD> (No longer used)
CE	4	Set top margin <CE><old top margin><new top margin><CE>
CF	3	Suppress page characteristics <CF><suppress codes><CF>
		Code bits: 1 - all suppressed, 2 - page numbers suppressed,
		4 - page numbers moved to bottom, 8 - all headers suppressed,
		16/32 - header a/b suppressed, 64/128 - footer a/b suppressed
D0	6	Set form length
		<D0><old form len><old # textlines><new form len>
			<new # textlines><D0>
D1	var	Header/footer
		<D1><old def byte><# half lines used by old header/footer><FF>
		<FF><lmargin><rmargin><text><FF>
		<# half lines used by new header/footer><new def byte><D1>
		Def Byte contents are type (two low-order bits) and occurrence
		(six high bits).  The low-order 2 bits of the Def byte must be
		correct.
		Type: 0 - header a, 1 - header b, 2 - footer a, 3 - footer b
		Occurrence: 0 - never, 1 - all pages, 2 - odd pages,
			4 - even pages
D2	var	Footnote <D2><fn#><# half lines><FF><lmargin><rmargin><text>
			<D2>
		(Not used in version 4.0 and above; see E4)
D3	4	Set footnote number <D3><old line #><new line #><D3>
		(Not used in version 4.0 and above; see E4)
D4	4	Advance to half line # <D4><old line #><advance to half line #
			<D4>
D5	4	Set 6/8 lines per inch <D5><old lpi code><new lpi code><D5>
D6	6	Set extended tabs
		<D6><old start><old increment><new start><new increment><D6>
D7	var	Define math columns
		<D7><old column def (24 bytes)>[<old calc 0>]<0>[<old calc 1>]
		<0>[<old calc 2>]<0>[<old calc 3>]<0><D7><new column def (24)>
		[<new calc 0>]<0>[<new calc 1>]<0>[<new calc 2>]<0>
		[<new calc 3>]<0><D7>
		For the column definition, see DD.
D8	4	Set alignment character <D8><old char><new char><D8>
D9	4	Set left margin release <D9><old #><new #><D9>
		(Not used in version 4.0 and above)
DA	4	Set underline mode <DA><old mode><new mode><DA>
		0 - single, broken 1 - double, broken 2 - single, continuous
		3 - double, continuous
DB	4	Sheet feeder bin number <DB><old #><new #><DB>
DC	var	End of page function
		<DC><# of half lines at end of page h><low>
		<# of half lines used for footnotes>
		<# of pages used for footnotes><# footnotes on this page>
		<ceop flag><suppress code><DC>
		If end of page is for the last column on the page, then after
		the suppress code and before the final function code there are
		five more bytes:
		<# of half lines for column 1-4><line # of column on>
DD	24	Define columns
		<DD><old # cols><L1><R1><L2><R2><L3><R3><L4><R4><L5><R5>
		<new # cols><L1><R1><L2><R2><L3><R3><L4><R4><L5><R5><DD>
		high order bit of # cols is 1 for parallel columns
DE	4	End of temporary margin
		<DE><old left temp margin><old right temp margin><DE>
DF	var	Invisible characters <DF><text><DF>
		If a character has an ASCII code >= 6F, it is represented as
		<6F><char - 6F>
E0	4	Left/Right temporary margin <E0><0><left margin difference><E0>
		Pre-4.0 format: <E0><new R margin><new L margin><E0>
E1	3	Extended Character <E1><character><E1>
E2	var	New Footnote/Endnote
		<E2><def><a><b><c><d><old ftnote line><# lines page 1>
		<# lines page 2><# lines page n><# pages><FF><L margin>
		<R margin><text><E2>
		def: bit 0: 0 - numbers, 1 - characters 1: 0 -footnote,
		1 - endnote
		a, b:If numbers, a&b are a 14-bit number.
		If letters, a = # of characters, b = a character
		c, d:14-bit number representing # of lines in note.
		For endnotes, there is only a null between <d> and <FF>.
E3	150	Footnote information (options) function
		<E3><old 74-byte value><new 74-byte value><E3>
		Bytes: 1 - spacing in footnotes, 2 - spacing between footnotes,
		3 - # of lines to keep together, 4 - flag (b ln en ft n)
		n - 1 if numbering starts on pg, en, ft: 0 - #'s, 1 - chars,
		2 - letters ln: 0 - no line separator, 1 - 2" line,
		2 - line btw margins b: 0 - footnotes after text,
		1 - footnotes at bottom of page
		5 - # of characters used in place of footnote #'s
		6-10: "numbering" characters
		11-74: four strings, alternating btw footnotes and endnotes
			Byte 1 - Length, Bytes 2-16 - String
E4	6	New set footnote number
		<E4><old # high><old # low><new # high><new # low><E4>
		The numbers are two 14-bit numbers.
E5	23	Paragraph number definition
		<E5><old 7 #'s><old 7 def bytes><new 7 def bytes><E5>
		Def Byte: Low nibble: 0/1 - upper/lower case Roman,
		2/3 - upper/lower case letter, 4 - Arabic, 5 - Arabic with
		previous levels separated by '.'
		High nibble: 0 - no punctuation, 1 - '.' after, 2 - ')' after,
		3 - '(' before, ')' after
E6	11	Paragraph number <E6><new level #><def byte><old 7 #'s><E6>
E7	3	Begin marked text <E7><def, info><E7>
		def (high nibble) 0 - toc, 2 - list info:level(0-6)/list #(0-4)
E8	3	End marked text <E8><def, info><E8> (ends an E7)
E9	8	Define marked text <E9><def, info><5 byte definition><E9>
		For tocs, the bytes represent five levels else the first
		definition byte is significant.
		Definition bytes: 0 - no page #'s , 1 - page # after text
		(preceded by two spaces), 2 - page # after text (in parens),
		3 - page # flush right, 4 - page # flush right w/dot leader
EA	var	Define index mark <EA><30 byte, null-terminated string><EA>
EB	32	Date/Time function <EB><30 byte null-terminated fmt string><EB>
EC	4	Block protect <EC><protect on?><# of half-lines in block><EC>