The strategy game Hearts of Iron or Civilization IV has mods set in Cambodia. A user named "Fatman" could have released a mod pack in 2010, with "-9-" being the ninth update or patch.
Likely a handle for a specific digital archivist or content uploader who was active during the late 2000s and early 2010s. 2010 Fatman Cambodia Series -9- 7z
The .7z extension is used by the 7-Zip software to compress large amounts of data. This specific file is the 9th installment in that series. Search Results for "2010 Cambodia Series" The strategy game Hearts of Iron or Civilization