The canukflags.zip file you have requested: Skins / Flags / Union Flag/Canadian Flags - 194.03kb is not available. Perhaps try browsing all files for the game Return To Castle Wolfenstein and upload any files you want to share or are missing. This is the only information we could locate:
From the author:
Includes new flags flying from flagpoles (in CP gamesonly), victory flags, limbo flags and uniform flags.
Changes Allied flags to Union flags or Canadian Flags.