You are downloading the MS-DOS Mobile XAP file v188.8.131.52 for Windows Phone. MS-DOS Mobile is a free and useful Productivity app: All the productivity you’ve come to expect from Microsoft in the simplest OS ... You can now download the offline XAP file to install & try it.
Download Locations for MS-DOS Mobile 184.108.40.206 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 MS-DOS Mobile XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.