Transfer steam app data (TF2) from Mac to PC

Solution 1:

The majority of TF2 content by file size is in .gcf files in SteamApps. If you simply copy the source *.tcf and team fortress 2 *.gcf files (maybe skip the ones with mac in the name…) over, they will much shorten the remaining download time, and there is no chance of overwriting user data files. Steam will automatically verify the files (that's why “Preparing to launch” takes so long!) and download the remainder.

I have done this myself before, but I forget whether I have done it across platforms. If the files are wrong it should do no harm as Steam will make any needed corrections.