I now need to open them & have really struggled to locate the original software, or any reference to it. Each file retains its original file name and suffix but has 'SD_' placed in front of it. Is there any way of finding out which software was used to encrypt the files, or a way of breaking the encryption (unlikely, I know).
The only thing I recall of the software is that it was a free download from about 18 months - 2 years ago. I've scoured the free SW sites to no avail - nothing looks familiar.
I am a tech support but I've reached a dead end with this. Any help greatfully received!
PS: I've attached a file in case anyone needs to check it