Here is an explanation of the sprites here, all are in 24-bit windows BMP format.

Full Screen Sprites:
-160x100 in size
int_logo.bmp - Splash Screen/Boot Sprite
menu_bg.bmp - Main Menu/Menu Background sprite

Cursor Sprites:
-8x8 in size
cursor_down.bmp - Down Cursor
cursor_left.bmp - Left Cursor
cursor_right.bmp - Right Cursor
cursor_up.bmp - Up Cursor

Explosion Sprites:
32_explodeN.bmp where N = [1,8] - Explosion sprites of size 32x32
40_explodeN.bmp where N = [1,8] - Same as above, but for 40x40 size

Ship Upgrade Sprites:
-16x16 sprites
shipN.bmp, where N goes from 1 to 5, the number explains the type of ship
1 - Monkey Raider
2 - Fork
3 - Tank
4 - Drill Winder
5 - Doom Master

Weapon Upgrade Sprites:
-16x16 sprites
weaponN.bmp, where N goes from 1 to 5, the number explains the type of weapon
1 - Titanium Round
2 - Depleted Uranium Round
3 - Photon Blast Cannon
4 - Nano Gun
5 - Rail Gun

Ammo Sprites:
-8x8 sprites, located in top left part of sprite
ammo1_titanium.bmp - Titanium Ammo
ammo2_du.bmp - Depleted Uranium Ammo
ammo3_photonblast.bmp - Photon Blast Ammo
ammo4_nano.bmp - Nano Ammo
ammo5_rail.bmp - Rail Ammo

Armor Upgrade Sprites:
-16x16 sprites
armorN.bmp, where N goes from 1 to 5, the number explains the type of armor
1 - Titanium Skin
2 - Magnetic Skin
3 - DU Skin
4 - Diamond Skin
5 - Carbon 60 Skin

Powerup Sprites:
-16x16 in size
gravity1.bmp - First sprite for Gravity Implosion Powerup
gravity2.bmp - Second sprite for Gravity Implosion Powerup
nuke.bmp - Nuke Powerup
speed1.bmp - Speed Boost Powerup (Animation part 1/4)
speed2.bmp - Speed Boost Powerup (Animation part 2/4)
speed3.bmp - Speed Boost Powerup (Animation part 3/4)
speed4.bmp - Speed Boost Powerup (Animation part 4/4)
weapon_boost.bmp - Weapon Boost Powerup

Player Ship Sprites:
-24x24, can be rotated in own sprite without sprite clipping
spaceship1.bmp - Monkey Raider
spaceship2.bmp - Fork
spaceship3.bmp - Tank
spaceship4.bmp - Drill Winder
spaceship5.bmp - Doom Master

Ally Ship Sprites:
-24x24 sprites, can be rotated within this 24x24 box without clipping loss!
allyship1.bmp - Delta V
allyship2.bmp - Flying Box
allyship3.bmp - Flamer

Enemy Ship Sprites:
-24x24, can be rotated within their sprite without clipping loss
badship1.bmp - Boomerang
badship2.bmp - The Bomb
badship3.bmp - Stinger
badship4.bmp - R 73
badship5.bmp - X Blaster
badship6.bmp - Jumper

Boss Ship Sprites:
-32x32, can be rotated within their sprite without clipping loss
boss1.bmp - Bumble Bee
boss2.bmp - The Key
boss3.bmp - Hornet
boss4.bmp - Mac