Issue with attachments

Hi,

I use my forum to share .sto files with people. Those sto files are iRacing car setups. iRacing is an online racing simulation.
The problem is that the forum mess up those sto files, so when we download those sto files, we can't open them in iRacing, seems the file is corrupted of some sort, as I have a message saying unable to open the setup.

So I wonder if you have an idea why uploading then downloading the file in the forum could change the content of the file.

Thanks

Not sure you can use software such as beyond compare to check the original vs the downloaded and see what changed.