Without much knowledge of Wine, I'd work around that problem making the program happy and giving it a disk that is smaller than 2 GB.
It's very simple. First, create a file filled with 0s that is 512 MB (or more, but less than 2048):
dd if=/dev/zero of=smalldisk.img bs=1M count=512
Next, format it using the default file system:
mkfs smalldisk.img
Move the existing directory to a temporary name:
mv .wine-demo .wine-demo-orig
Mount the new disk as a loop device at the original location:
sudo mount smalldisk.img .wine-demo
sudo chown your-user-name: .wine-demo
Copy the entire tree in:
cp -r .wine-demo-orig/* .wine-demo
And run the program from there. If it still doesn't work, then you'll need a different solution.
(There is, unfortunately, a chance that it won't work. If it can't handle 2 GB of disk space, it will probably not handle 2 GB of RAM...)
Provided it works, I suggest your unmount it and put it in your /etc/fstab:
/path/to/smalldisk.img /path/to/mount ext4 auto,noexec,rw,loop,fmask=0177,dmask=0077,user 0 0
In this line fmask and dmask are mask permissions for files and directories. Notice that they are the opposite of what you would use with chmod. That is, 7 stands for no permissions (---) and 0 stands for full permissions (wrx). Read more here: fstab Permission Masks Explained.
