Why? Because 64-bit Windows runs 32-bit applications inside the WOW64 (Windows-on-Windows 64) subsystem. These 32-bit processes cannot load 64-bit DLLs. They require the exact 32-bit runtime libraries, installed to C:\Windows\SysWOW64 (not System32 ).
| DLL Name | Description | SAP Usage | |----------|-------------|------------| | | Microsoft C Runtime Library | Standard C functions ( malloc , printf , string handling). Used by almost every SAP kernel binary. | | MSVCP80.dll | Microsoft C++ Runtime Library | C++ STL, iostreams, exception handling. Used by SAP C++ class libraries. | | MSVCM80.dll | Microsoft OpenMP Runtime | Parallel processing loops; used in SAP HANA client interfaces and certain DB loaders. | | Microsoft.VC80.CRT.manifest | XML manifest binding the runtime to the application | Ensures the correct version of the runtime is loaded. | sap microsoft redistributable runtime dlls vs2005 sp1 x86
Last updated: For Windows 10/11 and SAP GUI 7.40–7.60. Always verify against your specific SAP release using transaction ST05 or frontend version information. They require the exact 32-bit runtime libraries, installed
As of 2025, SAP GUI for Windows version 7.70 and above have migrated to newer toolchains (Visual Studio 2013, 2017, and 2019 runtimes). However, like SAP GUI 7.40 and 7.50 for compatibility with older backend systems or custom add-ons. | | MSVCP80