I use Linux, but I think I understand what you are talking about. There gitkis an option "Write commit to file" when you right-click on a commit, which by default invokes a dialog that executes the command git diff-tree --stdin -p --pretty.
git apply diff, .. , . git am , . , , , .
, , git am, git format-patch git diff-tree. , git am git diff-tree, , .