You are downloading the Physical Chemistry AppXBundle file v2017.812.1658.0 for Windows Phone. Physical Chemistry is a free and useful Books & Reference app: The appendix contains a description of physical chemistry. As implemented in the application easy ... You can now download the offline AppXBundle file to install & try it.
Download Locations for Physical Chemistry 2017.812.1658.0 AppXBundle file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline AppXBundle 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 Physical Chemistry AppXBundle file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.