Editting logmessages of the Subversion repository on windows is not possible by default. But you can do it by adding a little batch file.

You need to add the following batch file to the \hooks folder of your SVN Repository…

I slightly had to change the file that I found on http://svn.haxx.se/users/archive-2006-03/0107.shtml

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rem @ECHO OFF
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set repos=%1
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set rev=%2
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set user=%3
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set propname=%4
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set action=%5
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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:: Only allow changes to svn:log. The author, date and other revision
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:: properties cannot be changed
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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if /I not %propname%==svn:log goto ERROR_PROPNAME
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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:: Only allow modifications to svn:log (no addition/overwrite or deletion)
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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if /I not %action%==M goto ERROR_ACTION
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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:: Make sure that the new svn:log message contains some text.
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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set bIsEmpty=true
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for /f "tokens=*" %%g in ('find /V ""';) do (
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set bIsEmpty=false
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)
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if %bIsEmpty%==true goto ERROR_EMPTY
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goto :eof
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:ERROR_EMPTY
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echo Empty svn:log properties are not allowed. >&2
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goto ERROR_EXIT
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:ERROR_PROPNAME
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echo Only changes to svn:log revision properties are allowed. >&2
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goto ERROR_EXIT
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:ERROR_ACTION
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echo Only modifications to svn:log revision properties are allowed. >&2
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goto ERROR_EXIT
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:ERROR_EXIT
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exit /b 1 
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