I don't see why people copy shapes and sounds into their new add-ons.
It's not that hard to change "./explosionsphere1.dts" to "Add-ons/Weapon_RocketLauncher/explosionsphere1.dts"
Though the default files are generally small in size, we only need 1 of them.
Here's a few things I found:
Weapon_Zeus:
gunShell.dts
bullet.dts
-They are the exact same as gun's shapefiles.
Weapon_Windblast:
Windblast.dts
-Just a renamed wand.dts
Weapon_Thor:
explosionSphere1.dts
-Same as the rocket launcher's sphere.
Weapon_Stungun
bulletHit.wav
-Same as default.
Weapon_Stinger:
explosionSphere1.dts
rocketFire.wav
rocketLoop.wav
tntExplode.wav
-Same as the rocket launcher's files
Weapon_Sports:
All three dodgeballs
-Whoever made it could've made 1 .dts file, then used colorshifts.
Weapon_Snowball
spearFire.wav
-Same as spear
Weapon_ShadowBlast:
ShadowBlast.dts
-Just a renamed wand.dts
weapon_rpgweapons:
Plenty of copies of already existing weapons' shapefiles and sounds.
weapon_rpg7:
explosionSphere1.dts
-Same as the rocket launcher's sphere.
And many more I don't feel like listing.
Oh, and the problem exists in sounds for vehicles too.