Dimension pro: .... not found or couldn't be loaded

A list of flac files is presented when opening a file last used in December. Happens in 8.5.3 and X1ed.
 
The files are present.
 
Guidance please.
 
File d:\audiosamples\dimension pro\multisamples\garritan pocket orchestra\solo strings\viola solo ks 1 samples\vlac3c.flac not found or couldn't be loaded.
File d:\audiosamples\dimension pro\multisamples\garritan pocket orchestra\solo strings\viola solo ks 1 samples\vlac#3.flac not found or couldn't be loaded.