External diff greyed out

[Deleted user]

SourceTree version 3.4.4 in Windows 10

External diff tool is grayed out when right-clicking in the unstaged window after a merge conflict.

I've seen a previous post on this that does not apply i,e, In the Options/General Allow Sourcetree to modify your global Git and Mecurial config files is checked

In the Diff tab both the diff and the merge command are set to

C:\Program Files (x86)\WinMerge\WinMergeU.exe

the .gitconfig in my home directory has the following lines

[difftool "sourcetree"]
cmd = 'C:/Program Files (x86)/WinMerge/WinMergeU.exe' \"$LOCAL\" \"$REMOTE\"
[mergetool "sourcetree"]
cmd = 'C:/Program Files (x86)/WinMerge/WinMergeU.exe' \"$LOCAL\" \"$REMOTE\"
trustExitCode = true

I'd appreciate any help or workaround

[Christoffer Dam Bruun]

When you have merge conflicts then use "Resolve Conflicts"->"Launch External Merge Tool" instead