Find in files runs the `grep` program. If you select the `recursive` option the `-r` option is passed to grep. The `-r` option does not follow symlinks (on Linux or Windows). On Linux the `-R` option follows symlinks, and I presume it does on windows too. So set the `recursive` option off (to remove the `-r` ) and add `-R` to the `extra options` and see if it works. If it doesn't work check that your copy of grep works in the command line with that option.