https://devzone.nordicsemi.com/f/nordic-q-a/10743/what-the-forbidden-sign-means-in-keil-project-viewAs the picture shows! I have changed some Option of target and some forbidden sign appears. I guass it means the file is not available,if so, how can I delete it. Why It become not available? Why I can not add s110_nrf51_8.0.0_softdevice.hex. It woulden-USTelligent Community 13Wed, 09 Dec 2015 08:24:13 GMThttps://devzone.nordicsemi.com/thread/40148?ContentTypeID=1Wed, 09 Dec 2015 08:24:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4222efa6-56e9-4f8d-910e-2e79262e43c4shibshab<p>It means that the file is not used in the current target.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/40147?ContentTypeID=1Wed, 09 Dec 2015 08:06:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:17bc76f2-5d92-4fb8-8cbc-aba52b6b884eawneil<p>This is a <strong>Keil</strong> question - nothing to do with Nordic.</p> <p>See the uVision <strong>documentation</strong>: <a href="http://www.keil.com/support/man/docs/uv4/uv4_ca_filegrp_att.htm">www.keil.com/.../uv4_ca_filegrp_att.htm</a></p><div style="clear:both;"></div>