Please capitalize where necessary: this allows the intelligence of windows to decide the correct software application to open your trn file.
A: This allows the intelligence of Windows to decide the correct software application to open your TRN file.

Please capitalize where necessary: the resulting bar is very fragile, and producers must then sinter the bar.
A: The resulting bar is very fragile, and producers must then sinter the bar.

Please capitalize where necessary: unfortunately it was not possible to find more technical information on the german gid conditions.
A: Unfortunately it was not possible to find more technical information on the German gid conditions.

Please capitalize where necessary: i had to find someone who had had the same level of experience as i had.
A:
I had to find someone who had had the same level of experience as I had.