How to know on what mode (32 or 64-bit) the application pool from a Plesk website is running?

Question

How to know on what mode (32 or 64-bit) the application pool from a Plesk website is running?

How to enable 32-bits application mode?

Answer

It is possible to check that only in IIS (not through Plesk):

1. Connect to the server via RDP;
2. Go to Server Manager > Tools > IIS Manager > hostname > Application Pools > Right click on application_pool_name > Advanced properties;

• If the option "Enable 32 bit applications" is set to true, it runs on 32 bit mode;
• If the option "Enable 32 bit applications" is set to false, it runs in 64-bit mode.