AVS Special Member
Join Date: Apr 2011
Location: Ontario, Canada
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You have the same options with either receiver.
You can connect your receiver to your PC using either analogue audio cables, digital (optical or coaxial) audio cables or HDMI and use Winamp to play your FLAC files as you do now.
You can copy your FLAC files to a USB drive, plug it into the receiver and play the files from the receiver.
As you mentioned, you can steam your FLAC files from a DLNA server on your home network that supports FLAC files. The DLNA server that comes with Windows doesn't support FLAC so you'll need to find some other software.
With the later two options, where the receiver decodes the FLAC files, the transition between files will not be seemless, there will be a brief interruption between files. This isn't a problem for ordinary music files, but it can be noticable with live performances.