Finding files with .MD5 files with them

[pete_tr]

Hi. I need to find files and directories that contain files that have the .md5 files with them.
For example I have an .exe program and it has its MD5 together with it.
So in the directory there is:
program.exe
program.exe.md5

1. How do I make it so I can locate those and other files and ONLY those files?
2. Also a way to find the inverse: use it find files that do not have their md5 checksums in certain directories. So finding only program.exe because it doesn't have program.exe.md5 with it
3. How do I find lone .md5 files that got their file deleted? so if program.exe got deleted but program.exe.md5 still exists?

Any ideas?

[NotNull]

1. exact:file-exists:$name:.md5
2. path:"c:\certain directory 1\";"c:\certain directory 2\" !exact:file-exists:$name:.md5
3. ext:md5 !exact:exists:$stem:

[pete_tr]

This doesn't look too hard. I know some ways to use Everything but not to this extent. Guess I have to read the full documentation and experiment.
Thanks for the examples, I'm gonna use them when I have the time.

Edit: seems like they do the job, thank you very much.