To change the default installation folder, the data must be modified in the ProgramFilesDir key and a new path must be chosen for the installation folder. This can, however, be changed by selecting another folder or location or partition. So, once software programs are installed they go by default to C:\Program files on the computer.
It’s a convention that ensures proper inter-operation between your program and the OS’s application and security models. Microsoft recommends the C:\Program Files folder for the default installation destination. The typical path is normally in Windows 32-bit is C:\Program Files and in Windows 64-bit is C:\Program Files and C:\Program Files(x86).
In Windows 11/10/8/7 OS, by default, software gets installed on your System Drive, usually C drive, in the Program Files folder.
