In the Git repository, a number of arbitrary files have permission 755 (executable).
These are all across the repository, but for example, see:
git ls-tree master admin/
The correct permission would be 644 for all files except a very few which may be intended to be executable (eg something in filter/tex...).
This should be corrected so that only the files which are intended to be executable have that permission.
For information about git configuration, see::
(However note that I think this setting is default on windows.)