diff --git "a/test/fixtures/_filedir/a\\b/g" "b/test/fixtures/_filedir/a\\b/g"
deleted file mode 100644
index e69de29b..00000000
diff --git a/test/lib/library.exp b/test/lib/library.exp
index 968d7809..1af23f32 100644
--- a/test/lib/library.exp
+++ b/test/lib/library.exp
@@ -417,6 +417,16 @@ proc assert_exec {cmd {stdout ''} {test ''}} {
 }; # assert_exec()
 
 
+# Sort list.
+# `exec sort' is used instead of `lsort' to achieve exactly the
+#  same sort order as in bash.
+# @param list $items
+# @return list  Sort list
+proc bash_sort {items} {
+    return [split [exec sort << [join $items "\n"]] "\n"]
+}; # bash_sort()
+
+
 # Get hostnames
 # @return list  Hostnames
 proc get_hosts {} {
@@ -467,16 +477,6 @@ proc get_signals {} {
 }; # get_signals()
 
 
-# Sort list.
-# `exec sort' is used instead of `lsort' to achieve exactly the
-#  same sort order as in bash.
-# @param list $items
-# @return list  Sort list
-proc bash_sort {items} {
-    return [split [exec sort << [join $items "\n"]] "\n"]
-}; # bash_sort()
-
-
 # Initialize tcl globals with bash variables
 proc init_tcl_bash_globals {} {
     global BASH_VERSINFO BASH_VERSION COMP_WORDBREAKS
@@ -488,6 +488,12 @@ proc init_tcl_bash_globals {} {
 }; # init_tcl_bash_globals()
 
 
+# Detect if test suite is running under Cygwin/Windows
+proc is_cygwin {} {
+    expr {[string first [string tolower [exec uname -s]] cygwin] >= 0}
+}; # is_cygwin()
+
+
 # Expect items.
 # Break items into chunks because `expect' seems to have a limited buffer size
 # @param list $items
diff --git a/test/unit/_filedir.exp b/test/unit/_filedir.exp
index c5dd877e..2e4591e8 100644
--- a/test/unit/_filedir.exp
+++ b/test/unit/_filedir.exp
@@ -11,15 +11,22 @@ proc setup {} {
     assert_bash_exec { \
         complete -F _f -o filenames f2 \
     }
-    # Create directory `a*b'
-    # NOTE: directory `a*b' isn't included in Git, because a directory
-    #       containing an asterisk (*) causes troubles on Cygwin/Windows
-    assert_bash_exec {(cd fixtures/_filedir && [ ! -d a\*b ] && mkdir a\*b && touch a\*b/j || true)}
+    # Create directories `a*b' and `a\b' only when not running on Cygwin/Windows;
+    # directories containing `*' or `\' aren't allowed on Cygwin/Windows
+    if {! [is_cygwin]} {
+        # Create directory `a*b'
+        assert_bash_exec {(cd fixtures/_filedir && [ ! -d a\*b ] && mkdir a\*b && touch a\*b/j || true)}
+        # Create directory `a\b'
+        assert_bash_exec {(cd fixtures/_filedir && [ ! -d a\\b ] && mkdir a\\b && touch a\\b/g || true)}
+    }; # if
 }; # setup()
 
 
 proc teardown {} {
-    assert_bash_exec {(cd fixtures/_filedir && rm -- a\*b/j && rmdir a\*b/ || true)}
+    if {! [is_cygwin]} {
+        assert_bash_exec {(cd fixtures/_filedir && rm -- a\\b/g && rmdir a\\b/ || true)}
+        assert_bash_exec {(cd fixtures/_filedir && rm -- a\*b/j && rmdir a\*b/ || true)}
+    }; # if
     assert_bash_exec {unset COMPREPLY cur}
     assert_bash_exec {unset -f _f}
     assert_bash_exec {complete -r f}
@@ -79,12 +86,17 @@ foreach name {f f2} {
     sync_after_int
 
 
-    set test "completing $name a\\\\b/ should return g"
-    set cmd "$name a\\\\b/"
-    assert_complete_dir g $cmd "fixtures/_filedir"
+    # Execute these tests only when not running on Cygwin/Windows, because
+    # directories containing asterisk (*) or backslash (\) aren't allowed on
+    # Cygwin/Windows
+    if {! [is_cygwin]} {
+        set test "completing $name a\\\\b/ should return g"
+        set cmd "$name a\\\\b/"
+        assert_complete_dir g $cmd "fixtures/_filedir"
 
 
-    sync_after_int
+        sync_after_int
+    }; # if
 
 
     set test "completing $name a\\&b/ should return f"
@@ -147,12 +159,16 @@ foreach name {f f2} {
         sync_after_int
 
 
-        set test "completing $name 'a\\b/ should return g"
-        set cmd "$name 'a\\b/"
-        assert_complete_dir {g'} $cmd "fixtures/_filedir"
+        # Execute these tests only when not running on Cygwin/Windows, because
+        # directories containing `*' or `\' aren't allowed on Cygwin/Windows
+        if {! [is_cygwin]} {
+            set test "completing $name 'a\\b/ should return g"
+            set cmd "$name 'a\\b/"
+            assert_complete_dir {g'} $cmd "fixtures/_filedir"
 
 
-        sync_after_int
+            sync_after_int
+        }; # if
 
 
         set test "completing $name 'a&b/ should return f"