Yesterday I tried to open a Photoshop illustration I have recently created and opened several times before. It said Photoshop couldn't open it because it isn't a file type supported by Photoshop. The file extension was still .psd but the file type was now Adobe Photoshop Image.18. Today I tried again and now the file type is suddenly Adobe Photoshop Image.19. I have no idea what I've done and how to fix this. Photoshop now also automatically saves all files as Adobe Photoshop Image.19.
I now noticed Photoshop turns every file type I save (not only .psd, but also .png) into an Adobe Photoshop.19 file and has turned every .psd file I have on my computer into an Adobe Photoshop. 19 file. Somehow I can still open those.
.17, .18 & .19 are extensions from IBM. (IBM Voice Type Languages Scripts Data) I think there is a virus on your computer. Maybe you have virus or ransomware. I found this online that talks about Blank Ransomware. It says it can change extensions so this may be what you have on your system or something like this. Clean your system. This has to be a system issue.