linux: edit game properties + shader cache

[bachfugue]

Thanks for your quick answer.
You're right: I found the cache here: ~/.cache/dolphin-emu

For the editor: ok I can use a workaround by launching kate and navigating to the .ini file. It works fine.
Even better: I click on the .ini file and it opens with Kate.

I'm still puzzled about why I get the error (execvp(active-documentviewer, ....) failed. I investigated with:
>>xdg-mime query filetype RHDP8P.ini
>>application/x-wine-extension-ini

Then
>>xdg-mime query default application/x-wine-extension-ini
>>kate.desktop

And:
>>xdg-open RHDP8P.ini
which opens correctly the file with Kate (which is the expected behaviour).