Setting logminsize in Server 2008

[espresso]

I'm trying to setup the :logminsize for pre-commit comments. I have Visual SVN Server running on a dev server running Server 2008. I tried to rename the pre-commit.tmpl to .exe but it can't run the .exe over a 64-bit OS or something. How do you set the logminsize for each project or even globally to x # of chars?