Where can I find this dialog in Windows 7? I wasn't able to find it under settings of Bluetooth in Control panel.

It is not present in Windows 7. Devices are listed in Devices and Printers. Change settings for a Bluetooth enabled device Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.