Few days ago I’ve tried to setup my own server of Arma 3. So I installed it via steamcmd. Everything was ok until I try to start the arma3server.exe from the shortcut, then I received a system error stating that the program can’t start because XAPOFX1_5.dll is missing from your computer. Try reinstalling the program to fix this problem. I searched on forums and found that some users were able to fix that error by installing the latest version of DirectX, however I have the latest version and still have this error. Also, recently my friend who actively plays Borderlands 2 said that he faced the same problem with xapofx1_5.dll is missing error upon launching.
It looks like the xapofx1_5.dll is missing error happening in Arma 3 and Borderlands 2 is quite common and there is no clear solution for that. I’ve tried various tutorials posted on forums, but nothing worked for me and my friend. After that he said that he will try to manually install the xapofx1_5.dll library and check if it fixes the problem. After a while he called me and said that it works. So, basically we just downloaded and installed the xapofx1_5.dll file from http://fix4dll.com/xapofx1_5_dll. Afterwards, just followed the instructions provided on that website and it worked! The xapofx1_5.dll is missing error has gone and now we are able to run Arma 3 and Borderlands 2.
Hope this helps you to fix xapofx1_5.dll is missing error in Arma 3 and Borderlands. If this was helpful, do not hesitate to like and share.