Problem dll missing during Steam validation process

hi all,

I have just finished my game project and i am actually in the validation build process on steam.
but steam tell me that error appears when launching the exe.

“Title unable to launch due to missing X3DAudio1_7.dll and XAPOFX1_5.dll”

here the complete message from steam :

Title Launches Fail YOUR GAME fails to launch through Steam on Windows 10 due to a missing dependency. The issue also occurs when manually launching “Yourgame.exe” from the installation folder:
…\Steam\steamapps\common\GAME FOLDER\Yourgame.exe
The following error appears when launching the exe:
“Title unable to launch due to missing X3DAudio1_7.dll and XAPOFX1_5.dll”
The title launches without issue on Windows 7 where the DLL are installed and launches on Windows 10 after the missing DLL files are installed.

I have tested my game into 4 computers with different system (Win 7 64, Win8 64, Win 10 64) and all works perfectly.

have you got an idea to resolve this problem ?

thank you very much for your help.

Hello,

Take a look at the thread linked below and see if the solution on there works for you:

Edit: Also might be worth taking a look at this one as well: Unreal Engine won't launch Error code (0xc000007b) - Installation & Setup - Unreal Engine Forums

Let me know if this helps.

Have a great day!