lablgtk under windows, problems

Hello.
I'm attempting to use lablgtk under windows.I have already done a
functionnal installation under linux, but under windows I am experiencing
some problems.

I have to use native compilation for my programs, so I have installed Gtk+
runtime and gtk+-dev.
Then, I have attempted with two ways:
-first install of mingw and msys, but after I have seen that ocamlopt won't
go well under this environment.
-second  way install of  cygwin environment  to use  mingw in it (I don't
really understand why I have to do this way, but  I apply  it  as Ocaml
Readme  says)
Then I have installed ocaml (not the cygwin one, but downloaded on
caml.inria.fr)
And finally, I have installed lablgtk.

After all that (in many, many, many differents attempts) when I run
lablgtk2.bat testgtk.ml , this error is returned :

> Fatal error: exception Failure("float_of_string")

This happen with at the least one other tron.ml, not with about.ml.
I can test others if you want (need).

Under linux, these files don't cause any problem.

I don't see what to do now.. I have an application  to code, and want to
code it in Ocaml instead of C, but I can't choose it if I am not sure that
there is no problems under windows.
Maybe I have done something wrong, but now, I think I need your help :)

Thank you reading me, and I hope you can guide me

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