diff --git a/contrib/mercurial.spec b/contrib/mercurial.spec
--- a/contrib/mercurial.spec
+++ b/contrib/mercurial.spec
@@ -127,7 +127,6 @@ install -m 644 contrib/mercurial.el $RPM
 install -m 644 contrib/mq.el $RPM_BUILD_ROOT%{emacs_lispdir}/
 
 mkdir -p $RPM_BUILD_ROOT/%{_sysconfdir}/mercurial/hgrc.d
-install -m 644 contrib/mergetools.hgrc $RPM_BUILD_ROOT%{_sysconfdir}/mercurial/hgrc.d/mergetools.rc
 
 %clean
 rm -rf $RPM_BUILD_ROOT
@@ -150,7 +149,6 @@ rm -rf $RPM_BUILD_ROOT
 %config(noreplace) %{_sysconfdir}/bash_completion.d/mercurial.sh
 %dir %{_sysconfdir}/mercurial
 %dir %{_sysconfdir}/mercurial/hgrc.d
-%config(noreplace) %{_sysconfdir}/mercurial/hgrc.d/mergetools.rc
 %if "%{?withpython}"
 %{_bindir}/%{pythonhg}
 %{hgpyprefix}
diff --git a/contrib/win32/mercurial.iss b/contrib/win32/mercurial.iss
--- a/contrib/win32/mercurial.iss
+++ b/contrib/win32/mercurial.iss
@@ -67,7 +67,6 @@ Source: contrib\mq.el; DestDir: {app}/Co
 Source: contrib\hgweb.fcgi; DestDir: {app}/Contrib
 Source: contrib\hgweb.wsgi; DestDir: {app}/Contrib
 Source: contrib\win32\ReadMe.html; DestDir: {app}; Flags: isreadme
-Source: contrib\mergetools.hgrc; DestDir: {tmp};
 Source: contrib\win32\mercurial.ini; DestDir: {app}; DestName: Mercurial.ini; Check: CheckFile; AfterInstall: ConcatenateFiles;
 Source: contrib\win32\postinstall.txt; DestDir: {app}; DestName: ReleaseNotes.txt
 Source: dist\hg.exe; DestDir: {app}; AfterInstall: Touch('{app}\hg.exe.local')
@@ -86,6 +85,7 @@ Source: dist\cacert.pem; Destdir: {app}
 Source: doc\*.html; DestDir: {app}\Docs
 Source: doc\style.css; DestDir: {app}\Docs
 Source: mercurial\help\*.txt; DestDir: {app}\help
+Source: mercurial\default-hgrc.d\*.rc; DestDir: {app}\default-hgrc.d
 Source: mercurial\locale\*.*; DestDir: {app}\locale; Flags: recursesubdirs createallsubdirs skipifsourcedoesntexist
 Source: mercurial\templates\*.*; DestDir: {app}\Templates; Flags: recursesubdirs createallsubdirs
 Source: CONTRIBUTORS; DestDir: {app}; DestName: Contributors.txt
diff --git a/contrib/wix/mercurial.wxs b/contrib/wix/mercurial.wxs
--- a/contrib/wix/mercurial.wxs
+++ b/contrib/wix/mercurial.wxs
@@ -79,7 +79,7 @@
                     ReadOnly='yes' KeyPath='yes'/>
             </Component>
             <Component Id='mergetools.rc' Guid='$(var.mergetools.rc.guid)' Win64='$(var.IsX64)'>
-              <File Id='mergetools.rc' Name='MergeTools.rc' Source='contrib\mergetools.hgrc'
+              <File Id='mergetools.rc' Name='MergeTools.rc' Source='mercurial\default-hgrc.d\mergetools.rc'
                     ReadOnly='yes' KeyPath='yes'/>
             </Component>
             <Component Id='paths.rc' Guid='$(var.paths.rc.guid)' Win64='$(var.IsX64)'>
diff --git a/contrib/mergetools.hgrc b/mercurial/default.d/mergetools.rc
rename from contrib/mergetools.hgrc
rename to mercurial/default.d/mergetools.rc