Please capitalize where necessary: in the case that your d3f file doesn't open, it is highly likely that you do not have the correct software application installed on your pc to view or edit d3f file extensions.
A: In the case that your D3F file doesn't open, it is highly likely that you do not have the correct software application installed on your PC to view or edit D3F file extensions.

Please capitalize where necessary: the articles dealt with “current themes of the time illuminated by the cosmic plane and showing the lines along which they will come to develop in the new world culture”.
A: The articles dealt with “current themes of the time illuminated by the cosmic plane and showing the lines along which they will come to develop in the new world culture”.

Please capitalize where necessary: external temperature east (the ground floor open terrace awning east at high temperature, for example, {25deg})
A: External temperature east (The ground floor open terrace awning east at high temperature, for example, {25deg})

Please capitalize where necessary: as a 123 worker you: can work from home or cellphone choose your own work hours get paid for doing good work
A:
As a 123 worker you: can work from home or cellphone choose your own work hours get paid for doing good work