How to Fix Rmn40 GTA IV

Lots of people seem to be getting the RMN40 error. Well, this is the fix.

If you are one of the many people who are being plauged by the dreaded, “RMN40″ error for GTA IV, have no fear, theres a simple workaround that doesn’t include downloading any updates to your O/S. All it takes is some very basic knowledge of Windows XP, and a desire to fix the error.

Anyway, to fix this, go to


Now, when the “Run” dialog box appears, type “regedit” without any qoutes, and wait for the program to open.

At this point, there should be a box with seemingly random folders on your screen, well, they’re not random, this is the windows Registry. Without going into too much detail, this is where many Windows Programs (and the OS itself) keeps a bunch of important info.

Now, you need to navigate to


Once here, look for a file named “CSD Version” or something similar. Double click on it, and change whatever number is there to 300.

And that’s it, you fixed the RMN40 error.

Liked it
  1. patrik
    Posted March 15, 2009 at 1:35 pm

    is not working :( ((

  2. patrick
    Posted March 24, 2009 at 3:54 am

    awts…my game is not updated…

  3. lester
    Posted March 24, 2009 at 3:55 am

    thanks…it really works

  4. Beatle
    Posted May 17, 2009 at 5:44 am

    300 in hexadecimal or decimal. cus mine was already on 300 but decimal. etherway it didnt work.

  5. mike
    Posted June 25, 2009 at 11:34 am

    it does work u gotta restart and if ur worried about decimals and hex here a link to apatch i created


  6. Posted July 9, 2009 at 3:34 pm

    Its just great, works smoothly, thx man, thx for the tips.

  7. Selva
    Posted November 28, 2009 at 1:00 am

    Thanks for the Help
    it works only after restarting the system

    U ROCK!!!!!

  8. bike
    Posted May 21, 2010 at 9:06 pm

    it doesn’t have any file like”csd version” i use win 7

  9. Rockstart games lover
    Posted September 6, 2010 at 6:36 pm

    i do what u told me but no thing has been changeed
    plz i wana the game plz

  10. polita123
    Posted February 2, 2011 at 8:22 am

    nothing changed I am using win 7 ultimate. pls help! T_T

  11. Matt
    Posted April 3, 2011 at 2:52 am

    it already is 300 :S And nothing happened :(

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