Important, read carefully

[absol]

I want to put my .msi file on the flash drive when I connect it to a computer, it opens the .msi program automatically on any computer that connects to open automatically. What should I do?

[uintdev]

As there is no USB mass storage autorun, the 'flash drive' may need to be able to 'act' as a HID (keyboard input) and initiate USB mass storage at the same time.

In terms of Hak5's products, the USB Rubber Ducky (with 'twin duck' firmware flashed onto it -- SD storage access is a little slow) and the Bash Bunny can do that. As those involve keyboard input, some UI elements (i.e. cmd or run prompt for entering the command -- depends on the chosen method) will show very briefly.