her's modded nullDC's GD-ROM plugin 'GDR_Win32.dll' (based on Aug 20 2008)
it redefines .gdi syntax parsing for file names
with it file names with whitespaces within them can be used enclosed in quotation marks
e.g.

19
01 0 0 0 "none" 0
02 0 0 0 "none" 0
03 45000 4 2352 "Track 03.bin" 0
04 355602 0 2352 "Track 04.bin" 0
05 363680 0 2352 "Track 05.bin" 0
06 377124 0 2352 "Track 06.bin" 0
07 379975 0 2352 "Track 07.bin" 0
08 386064 0 2352 "Track 08.bin" 0
09 393416 0 2352 "Track 09.bin" 0
10 395488 0 2352 "Track 10.bin" 0
11 399325 0 2352 "Track 11.bin" 0
12 408596 0 2352 "Track 12.bin" 0
13 433134 0 2352 "Track 13.bin" 0
14 458158 0 2352 "Track 14.bin" 0
15 465757 0 2352 "Track 15.bin" 0
16 493667 0 2352 "Track 16.bin" 0
17 503104 0 2352 "Track 17.bin" 0
18 505295 0 2352 "Track 18.bin" 0
19 505819 4 2352 "Track 19.bin" 0

place it in 'plugins' sub-directory and it should show up on plugin selection list
to use .gdis without quotation marks switch back to unmoded plugin

http://www.mediafire.com/?ym2acwgr3dn