This small tutorial explains how replace the Synergy integrates file compare / merge tool with WinMerge.
Edit the ccm.properties file placed by default in the following directory:
C:\Program Files\IBM\Rational\Synergy\7.1\etc\
Find the lines that starts with:
windows.tool.compare.ascii
windows.tool.merge.ascii
Replace the lines with this lines changing the path where you have WinMerge installed:
windows.tool.compare.ascii = "E:/Apps/Develop/WinMerge/WinMerge.exe" "%file1" "%file2"
windows.tool.merge.ascii = "E:/Apps/Develop/WinMerge/WinMerge.exe" "%file1" "%file2" "%outfile"
That's all, now you have the power of WinMerge integrated with IBM Rational Synergy.