"perl" cannot run scripts in paths with non-ASCII characters on Windows.
To work around that, change to the directory containing the script first,
then call it without path.
FIXME: Could changing the directory have negative side effects for the
"makeinfo" script?

diff --git "a/util/makeinfo.bat" "b/util/makeinfo.bat"
index 5ae4286..6a51502 100644
--- "a/util/makeinfo.bat"	
+++ "b/util/makeinfo.bat"	
@@ -1,2 +1,4 @@
 @echo off
-perl "%~dpn0" %*
+%~d0
+cd "%~dp0"
+perl "%~n0" %*