I like using WinMerge instead of TortoiseMerge with TortoiseSVN for comparing changes between separate revisions of a file. I can configure this for most things in the TortoiseSVN settings (context menu > "TortoiseSVN" > "Settings" > "Diff Viewer"):
However, when I want to compare files in a particular revision against the those in the working copy, it uses TortoiseMerge. To see what I mean, go to the TortoiseSVN log viewer from the working copy: right-click in the working copy folder, select "TortoiseSVN" > "Show log", right-click on a prior revision, and select "Compare with working copy". Then, double-click the file of interest in the list of "file patches" that appears.
Is there any way to get it to use WinMerge instead of TortoiseMerge for these cases?