Here's a new version that should fix the issue. The problem is actually FSET. When you use the C button, it copies according to the system format, but when you use the P button, it will only work if the decimal marks are periods instead of commas.
This new version of the Excel tool compensates for that issue and should work with it whether your system uses commas or periods: https://www.dropbox.com/s/zv3c…gridcoords_v1.6.xlsm?dl=1
Please test it and let me know you encounter any other problems!
I use the Excel tool with a simple example:
Why the northwest corner is 0,703106N latitude instead of 0,703125N latitude???