I only messed around with the content of ISO files when the PSP dev scene was relatively new, and I can comfortably say that I didn't come across files with those particular extensions back then. After a little Google action I was able to make these finds. First of all, they are both XML file type variants.
.ehp <clicky--- A .ehp file seems to be a file which refers to other files for some type of authorization. Another site I looked at said the following (blue)
XML-based Project File, uses UTF-8 text encoding. HelpLogic assists with help authoring. Also, it will generate custom code for you to paste into your REALbasic project to launch your help book or context-sensitive help. This is a Macintosh OS X product. The product has an "EBHL" Mac Creator Code registered with Apple Computer.
Odd that it seems it's a product from OS X. Also, apparently .ehp is used through emails to infect computers sometimes.
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
As for .cip, that is known as a "Custom Installation Package". Those have been known to be used to infect people with viruses as well as keyloggers and such. Of course, they can have innocent uses as well. They're commonly used to hold singular encrypted files which may have repeating or redundant coding in them, in order to make their file size smaller, i.e. compression.
The odd thing I am questioning is ... "Why are these files in your .ISO file?". What are the full names of the files and where are they (directory-wise) in the .ISO?
As a last note, those types of files are, as I mentioned above, XML-based. You should be able to open them up in a simple word editor like Notepad. Regarding the .ehp file(s) you may even be able to see exactly what files it "refers" to or communicates with.
-DarkPacMan77-