What the heck is "coral"?
whoops sorry typo..corel not coral...it is a painter program
Ah. Getting out my crystal ball...
You're on a Windows system, right? Which one?
Just guessing here... You're right-clicking a file in what, File Explorer, and in the Context Menu under some conditions you're not seeing Photoshop listed as one of the applications that can open the file?
Do you have file extensions visible in Explorer?
What are the file extensions of the files for which you do not see Photoshop listed?
I realize I might have taken a wrong turn anywhere up above. More information would help folks to help you more accurately.
With the correction to Corel, I am with you - most likely a File Association issue. This could be especially true, if Corel (PhotoPaint, etc.) has been installed more recently, than Ps - some program automatically alter File Associations, upon installation, and the user has to go in, and clean that up.
Once, Apple's QT Player would change almost EVERY File Association on a PC to use it - even for file formats, that QT Player could not handle, like .DOC, etc.. Fortunately, more and more programs allow the user to choose which formats will be associated with the program being installed, but some have not "grown up" yet.
Hope that you are correct, as that will be an easy fix.