I need to execute some additional configuration after installation so I have created a smoll PostInstall.exe console application which should do the work. I need to get winamp install path from the registry.
This PostInstall.exe works fine if I run it alone. But if I use it in custom action "After Register Product", I get an error "The system cannot find the file specified" returned from the function
DWORD kres = RegOpenKeyExW(HKEY_CURRENT_USER, L"Software\\Winamp",0, KEY_QUERY_VALUE, &hKey);
I am 100% sure that the key exists - I verify it before I launch installation. Also when I run PostInstall.exe manually after installation, it succeeds.
I have tried to set "Deferred Execution" and "Deferred execution in system context" but that does not help.
Why does RegOpenKeyEx fail in my custom action?