Many older video editing suites and 3D modeling tools (like older versions of 3ds Max or CAD software) require DX9 to render the viewport correctly.
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If you have a slow internet connection or need to install it on multiple machines, look for the . This is a 95MB package that contains every DX9 file ever released. You extract it to a folder and run DXSETUP.exe . Final Verdict Many older video editing suites and 3D modeling
It will install the missing files into your SysWOW64 and System32 folders. Pro Tip: The Offline Redistributable directx 9 download windows 7 64 bit better