I don't think this Registry issue you fixed has anything to do with your computer not waking up anymore after switching to power safe mode.
This .xps format is a document file type and I think this has nothing to do with your problems and Registry entries with the "OpenWithList" description found by CCleaner's Registry cleaner tend to be recreated anyway after an interaction with such file types. My advise would be to do a system restore or scan your computer for any malware.
If CCleaner's Registry cleaner seems a bit too "strong" you can use an older version of CCleaner which is v.3.03.1366 still available for download here: