Search your local storage specifically for "RU012317" to find all related photos from that set.
If you have lost the original folder and only have this filename:
Since this is the "lrg" version, it is likely the best choice for physical prints (up to 8x10 or larger depending on actual pixel count). mrs_cristin_caitlin_RU012317_lrg_176
"lrg" indicates a high-resolution or "large" version of the file, suitable for printing or detailed editing.
The prefix "mrs_cristin_caitlin" suggests the photographer or studio. Search your local storage specifically for "RU012317" to
Search your inbox for "Cristin Caitlin" or the project code to find the original delivery link or download instructions from the photographer.
File it under a hierarchy like: /Photography/2017/Jan_23_RU/High_Res/ . 2017) or a unique project ID.
"RU012317" typically represents a specific shoot date (January 23, 2017) or a unique project ID.