diff --git a/runtime/indent/ishd.vim b/runtime/indent/ishd.vim
new file mode 100644
index 0000000..9b4d7ff
--- /dev/null
+++ b/runtime/indent/ishd.vim
@@ -0,0 +1,65 @@
+" Description:	InstallShield indenter
+" Author:	Johannes Zellner <johannes@zellner.org>
+" Last Change:	Tue, 27 Apr 2004 14:54:59 CEST
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+    finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetIshdIndent(v:lnum)
+setlocal indentkeys&
+setlocal indentkeys+==else,=elseif,=endif,=end,=begin,<:>
+" setlocal indentkeys-=0#
+
+" Only define the function once.
+if exists("*GetIshdIndent")
+    finish
+endif
+
+fun! GetIshdIndent(lnum)
+    " labels and preprocessor get zero indent immediately
+    let this_line = getline(a:lnum)
+    let LABELS_OR_PREPROC = '^\s*\(\<\k\+\>:\s*$\|#.*\)'
+    let LABELS_OR_PREPROC_EXCEPT = '^\s*\<default\+\>:'
+    if this_line =~ LABELS_OR_PREPROC && this_line !~ LABELS_OR_PREPROC_EXCEPT
+	return 0
+    endif
+
+    " Find a non-blank line above the current line.
+    " Skip over labels and preprocessor directives.
+    let lnum = a:lnum
+    while lnum > 0
+	let lnum = prevnonblank(lnum - 1)
+	let previous_line = getline(lnum)
+	if previous_line !~ LABELS_OR_PREPROC || previous_line =~ LABELS_OR_PREPROC_EXCEPT
+	    break
+	endif
+    endwhile
+
+    " Hit the start of the file, use zero indent.
+    if lnum == 0
+	return 0
+    endif
+
+    let ind = indent(lnum)
+
+    " Add
+    if previous_line =~ '^\s*\<\(function\|begin\|switch\|case\|default\|if.\{-}then\|else\|elseif\|while\|repeat\)\>'
+	let ind = ind + &sw
+    endif
+
+    " Subtract
+    if this_line =~ '^\s*\<endswitch\>'
+	let ind = ind - 2 * &sw
+    elseif this_line =~ '^\s*\<\(begin\|end\|endif\|endwhile\|else\|elseif\|until\)\>'
+	let ind = ind - &sw
+    elseif this_line =~ '^\s*\<\(case\|default\)\>'
+	if previous_line !~ '^\s*\<switch\>'
+	    let ind = ind - &sw
+	endif
+    endif
+
+    return ind
+endfun