Network Share Setup Some Files"missing"

I have a network share setup b/w a Vista Ultimate x32 and XP machines. Using the XP machine, I open the Vista hosted share but found some files "missing", ie. even though they physically exist in the Vista machine, I simply cannot see them from XP. Turns out that these files are missing the EVERYONE in the File Permissions (right click file, properties, security). These are files downloaded using Firefox, and whether they are JPG, AVI, TXT, DOC, XLS they are all missing the EVERYONE permission. If I download the same files using Internet Explorer, the files get created with the EVERYONE permission.

My current workarounds ... which none are desirable are this:Use Internet Explorer, Add EVERYONE permission for each file manually (you have to do this one by one, can't select multiple files and perform bulk operation),Use CMD line utilities like takeown and icacls Note this is a secure home network, and while file sharing using EVEYRONE isn't the safest way to do this, I can finetune this later. The key problem at hand is what I've described above. I'd be happy just to be able to get FireFox create files with the full permissions, same way IE does.