APFS and Boot Camp
Deal with Windows and APFS incompatibility
If you download files in macOS that you need to access in Boot Camp, and High Sierra has converted your macOS volume to APFS, you’ll need to rethink how you do this because Windows can’t read APFS, even with Apple’s Boot Camp software installed. You might move files to an external drive that’s in a Windows-readable format (FAT or exFAT, say), switch to downloading in Windows itself if that’s the only place files are needed, or use a product such as Paragon’s NTFS for Mac ($19.95, bit.ly/prgnntfs) to write to the Boot Camp partition from within macOS.