http://bugs.winehq.org/show_bug.cgi?id=31113
--- Comment #127 from Von Random von+winehq@vdrandom.org --- Here's how I did it: 1. Created the 10G loop file and formated it in NTFS.
2. Mounted it into my steam wineprefix location, specifically where it installs Civ5. (Well, not directly, I used the power of symlinks, so that my fstab doesn't get ugly.): ~ % mount|grep civ5 /home/username/opt/civ5.disk on /media/civ5 type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
~ % ll ~/.wine/drive_c/Steam/steamapps/common/Sid\ Meier's\ Civilization\ V lrwxrwxrwx 1 username users 11 May 4 21:44 /home/username/.wine/drive_c/Steam/steamapps/common/Sid Meier's Civilization V -> /media/civ5
3. Run steam from that wineprefix and install Civ5 as usual. Takes some time since NTFS-3g is slower than native fs.
4. Run the game from steam. Works like a charm.