Navigate to your Realms of the Haunting folder (Steam\Steamapps\Common\Realms of the Haunting) and look for the mapper.txt. Then just replace the content with this stuff:

hand_shutdown "key 290 mod1"
hand_capmouse "key 291 mod1"
hand_fullscr "key 13 mod2"
hand_pause "key 19 mod2"
hand_mapper "key 282 mod1"
hand_speedlock "key 293 mod2"
hand_recwave "key 287 mod1"
hand_caprawmidi "key 289 mod1 mod2"
hand_scrshot "key 286 mod1"
hand_video "key 286 mod1 mod2"
hand_decfskip "key 288 mod1"
hand_incfskip "key 289 mod1"
hand_cycledown "key 292 mod1"
hand_cycleup "key 293 mod1"
hand_caprawopl "key 288 mod1 mod2"
hand_swapimg "key 285 mod1"
key_esc "key 27"
key_f1 "key 282"
key_f2 "key 283"
key_f3 "key 284"
key_f4 "key 285"
key_f5 "key 286"
key_f6 "key 287"
key_f7 "key 288"
key_f8 "key 289"
key_f9 "key 290"
key_f10 "key 291"
key_f11 "key 292"
key_f12 "key 293"
key_grave
key_1 "key 49"
key_2 "key 50"
key_3 "key 51"
key_4 "key 52"
key_5 "key 53"
key_6 "key 54"
key_7 "key 55"
key_8 "key 56"
key_9 "key 57"
key_0 "key 48"
key_minus "key 45"
key_equals "key 61"
key_bspace "key 8"
key_tab "key 9"
key_q "key 60"
key_w "key 119"
key_e "key 46"
key_r "key 114"
key_t "key 116"
key_y "key 121"
key_u "key 117"
key_i "key 105"
key_o "key 111"
key_p "key 112"
key_lbracket "key 91"
key_rbracket "key 93"
key_enter "key 13"
key_capslock "key 96"
key_a "key 32"
key_s "key 115"
key_d "key 100"
key_f "key 102"
key_g "key 103"
key_h "key 104"
key_j "key 106"
key_k "key 107"
key_l "key 108"
key_semicolon "key 59"
key_quote "key 39"
key_backslash "key 92"
key_lshift "key 304"
key_lessthan "key 60"
key_z "key 122"
key_x "key 120"
key_c "key 99"
key_v "key 118"
key_b "key 32"
key_n "key 110"
key_m "key 109"
key_comma "key 44"
key_period "key 46"
key_slash "key 47"
key_rshift "key 303"
key_lctrl "key 306"
key_lalt "key 308"
key_space "key 118"
key_ralt "key 307"
key_rctrl "key 305"
key_printscreen "key 316"
key_scrolllock "key 302"
key_pause "key 19"
key_insert "key 277"
key_home "key 278"
key_pageup "key 280"
key_delete "key 127"
key_end "key 279"
key_pagedown "key 281"
key_up "key 119"
key_left "key 97"
key_down "key 115"
key_right "key 100"
key_numlock "key 300"
key_kp_divide "key 267"
key_kp_multiply "key 268"
key_kp_minus "key 269"
key_kp_7 "key 263"
key_kp_8 "key 264"
key_kp_9 "key 265"
key_kp_plus "key 270"
key_kp_4 "key 260"
key_kp_5 "key 261"
key_kp_6 "key 262"
key_kp_1 "key 257"
key_kp_2 "key 258"
key_kp_3 "key 259"
key_kp_enter "key 271"
key_kp_0 "key 256"
key_kp_period "key 266"
jbutton_0_0
jbutton_0_1
jaxis_0_1-
jaxis_0_1+
jaxis_0_0-
jaxis_0_0+
jbutton_0_2
jbutton_0_3
jbutton_1_0
jbutton_1_1
jaxis_0_2-
jaxis_0_2+
jaxis_0_3-
jaxis_0_3+
jaxis_1_0-
jaxis_1_0+
jaxis_1_1-
jaxis_1_1+
jbutton_0_4
jbutton_0_5
jhat_0_0_0
jhat_0_0_3
jhat_0_0_2
jhat_0_0_1
mod_1 "key 305" "key 306"
mod_2 "key 307" "key 308"
mod_3

Otherwise you can change your controls manually ingame with CTRL+F1

Source: http://steamproxy-script.pipiskins.com/app/292390/discussions/0/558754259947925709/ (Thanks to Cirrusstrafe)

Press LMB+RMB for free look. (its easier than this numpad 3 or numpad 9 stuff)

F9 for quicksave, F10 for quickload. Beware! The game will ask you for saving, but not for loading. So make sure, you hit the right button.

1-6 is for fast weapon switches. 1 are always your fists but you can sort the others. Just go in your inventory and make sure, your weapons are in the top line(and in the right order you want them)

Don`t tab out, while playing. The game resolution is very old( hey, it`s 1996) and the game change in (a little) window mode and don`t change back to fullscreen.
If you tab out and get window mode press Alt + Enter to go back in fullscreen mode


If you find florentines staff, don`t use it. It`s a powerful weapon, but you can not recharge/reload it.

i`m not that good in english(look at this guide!). So I found a german patch(1.1 GB) for the game(audio and text).
Just go to this page: https://www.compiware-forum.de/downloads/index.php/Entry/202-Realms-of-the-Haunting-German-Patch/ and registrate(didn`t find one without registration) and download it. Then install it in the folder of your game(probably in your Steam folder)

If you have suggestions or feedback, post it below. Perhaps you have a patch for your language and want to share it with us? :-)

Hope, I was helpful.

Enjoy the game!