How to Fix "MSFLXGRD.OCX is Missing" on Windows 10 (64-bit) If you are trying to run an older application—often developed in Visual Basic 6.0—and encounter Run-time error '339' , it usually means the MSFLXGRD.OCX file is missing or not registered. This file, known as the Microsoft FlexGrid Control
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Because Windows 10 (especially the 64-bit edition) does not natively include this control, programs relying on msflxgrd.ocx will fail to run unless you manually install and register the file. How to Fix "MSFLXGRD
Because msflxgrd.ocx is a 32-bit control , it must be placed in C:\Windows\SysWOW64 (not System32) on Windows 10 64-bit. It must also be registered using the 32-bit version of regsvr32 , located at C:\Windows\SysWOW64\regsvr32.exe . Because msflxgrd