Copy file steam_api_ext.dll to the installation directory of the program that is requesting steam_api_ext.dll.
If that doesn't work, you will have to copy steam_api_ext.dll to your system directory. By default, this is:
Windows 95/98/Me - C:\Windows\System
Windows NT/2000 - C:\WINNT\System32
Windows XP, Vista, 7, 10 - C:\Windows\System32
If you use a 64-bit version of Windows, you should also copy steam_api_ext.dll to C:\Windows\SysWOW64\
Make a backup copy of the original files
Overwrite any existing files
Reboot your computer.
If the problem still occurs, try the following:
Open Windows Start menu and select "Run...".
Type CMD and press Enter (or if you use Windows ME, type COMMAND)
Type regsvr32 steam_api_ext.dll and press Enter.

If you can't find windows directory try the following:
Open Windows Start menu and select "Run...".
Type CMD and press Enter (or if you use Windows ME, type COMMAND)
Type %WINDIR% and press Enter.

steam:

steam (2).dll 2.0.0.0 3256kb.	Steam Client Engine	26.09.2003
steam.dll 2.0.0.0 3376kb.	Steam Client Engine	12.12.2003
filesystem_steam (2).dll 132kb.		26.09.2003
filesystem_steam.dll 120kb.		14.11.2003
steamui.dll 1368kb.		26.09.2003
steam.exe 1.0.0.0 936kb.	Steam	28.09.2012
steam_dev.exe 168kb.		28.09.2012
steamengine.exe 136kb.		28.09.2012
steam (2).dll 2.0.0.0 414kb.	Steam Client Engine	05.06.2010
steam (4).dll 2.0.0.0 304kb.	Steam Client Engine	23.12.2007
steamclient (2).dll 3, 0, 0, 1 5730kb.	Steamclient.dll	03.06.2011
steamclient (3).dll 351kb.		29.04.2009
steamclient.dll 1657kb.		11.07.2011
steam.dll 2.0.1100.464 2885kb.	Steam Client Engine	03.06.2011
steam_api.dll 1, 0, 0, 1 68kb.	Steam Client API	18.10.2012
steam_api.dll 125kb.		10.10.2012
steamapiupdater.dll 1.0.0.0 1266kb.	Steam Game Updater	09.10.2012
steam_rld.ini 1kb.		26.10.2012
steam_api.dll 1, 0, 0, 1 118kb.	Steam Client API	26.10.2012
steam_api.dll 1, 0, 0, 1 126kb.	Steam Client API	27.10.2012

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