You are downloading the NatWest XAP file v3.4.5450.2754 for Windows Phone. NatWest is a free and useful Personal Finance app: How to RegisterThe NatWest Mobile Banking app is available to NatWest Personal and Business customers with Online Banking, who are over 11 ... You can now download the offline XAP file to install & try it.
Download Locations for NatWest 3.4.5450.2754 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP File To Install It Any More.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline NatWest XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.