How do I remove files saying “old mode 100755 new mode 100644” from unstaged changes in Git?
That looks like unix file permissions modes to me (755=rwxr-xr-x, 644=rw-r–r–) – the old mode included the +x (executable) flag, the new mode doesn’t. This msysgit issue’s replies suggests setting core.filemode to false in order to get rid of the issue: git config core.filemode false