Okay, something is weirdly amiss. The error still occurs with only one data line (which looks well-behaved to me) and the header line modified to give names to fields previously empty (so I didn't change the number of commas, but put something between the ones that had nothing there).

"Volume.label","Volume.serialno","Volume.vtype","Volume.netname","Volu
+me.filesystem","Path.name","other.nothing","Thumbnail.checksum","Thum
+bnail.width","Thumbnail.height","Thumbnail.horiz_res","Thumbnail.vert
+_res","Thumbnail.colortype","Thumbnail.colordepth","Thumbnail.gamma",
+"Thumbnail.thumbnail_width","Thumbnail.thumbnail_height","Thumbnail.t
+humbnail_type","Thumbnail.thumbnail_size","Thumbnail.name","Thumbnail
+.metric1","Keywords.pkeywords","nothing.nothing"
PCD0138,,4037894171,5,\\ddb\r$,CDFS,PHOTO_CD\IMAGES,1,0,0,"1996-09-30T
+21:38:57","2002-10-12T00:29:25",3368960,2147483648,512,768,0,0,0,24,0
+,68,100,518,336,IMG0002.PCD,m0000000000000000000000000000000000000000
+000000000000000000000000000000000000000000000000000000000000000000000
+000000000000000000000000000000000000000000000000000000000000000000000
+00000000000000,b00000000000000000000000000000000,,0,";",lose
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My code remains the same as the original post, and the error message remains precisely the same. Here's the output, along with a bit more info about the file:

ddb@DDB4 /cygdrive/p/work/tpdbfix/app
$ ./readtpexport.pl  play-thumbs.txt
play-thumbs.txt
Point a
Strings with code points over 0xFF may not be mapped into in-memory fi
+le handles
readline() on closed filehandle $h at /usr/lib/perl5/site_perl/5.22/i6
+86-cygwin-threads-64int/Text/CSV_XS.pm line 830.
 at ./readtpexport.pl line 25.

ddb@DDB4 /cygdrive/p/work/tpdbfix/app
$ file play-thumbs.txt
play-thumbs.txt: UTF-8 Unicode (with BOM) text, with very long lines

ddb@DDB4 /cygdrive/p/work/tpdbfix/app
$ ls -l play-thumbs.txt
-rwxrwxr-x 1 ddb Unix_Group+1001 874 Jun  7 18:41 play-thumbs.txt
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