I confess that I was in a Win32 cmd session when I found my Ocamlbrowser.exe to be totally unresponsive.
Addressing the problem was complicated by my having already upgraded to ActiveState TCL/TK 8.4
My suggestion is that if you have not yet upgraded your TCL/TK, preserve the DLL’s at least the .\lib directory before you uninstall ( my note on the Curl RTE resonates here … as to why we must uninstall. But wait until I recount the ‘harrowing’ of a PLONE upgrade… )
Assuming that you can get to say, a TCL 8.3.5 install, you can restore OCamlbrowser.
The answer came when I tried to launch from with a CYGWIN XTerm. As so often, useful error information began to flow. Here were the 4 steps
Copy tcl83.dll to the ocaml/bin
Copy tk83.dll to the ocaml/bin
Copy the directory tcl8.3 from the TCLTK/lib to the ocaml/lib
Copy the directory tk8.3 from the TCLTK/lib to the ocaml/lib
And welcome to your restored Ocamlbrowser (in my case 3.09.3 )
PS It seems that the Perl camel is named “Amelia” …