I'm running Foobar2000 v1.0 beta 5 on Windows 7 Ultimate 64 bit and foo_vis_shpeck 0.3.7. Milkdrop doesn't appear in the pick list of available plugins, only Advanced Visualization Studio.
Foobar's console:
[Shpeck] Searching for plugins, file mask = "C:\Program Files (x86)\Winamp\Plugins\vis_*.dll"...
C:\Program Files (x86)\Winamp\Plugins\vis_avs.dll - module #0 - validated, added to list (Advanced Visualization Studio).
C:\Program Files (x86)\Winamp\Plugins\vis_milk2.dll - could not load the DLL (probably caused by unresolved DLL dependencies).
C:\Program Files (x86)\Winamp\Plugins\vis_nsfs.dll - could not load the DLL (probably caused by unresolved DLL dependencies).
[Shpeck] Plugin search done.
Proc Monitor output:
21:36.9 foobar2000.exe 2860 QueryOpen C:\Program Files (x86)\Winamp FAST IO DISALLOWED
21:36.9 foobar2000.exe 2860 CreateFile C:\Program Files (x86)\Winamp SUCCESS Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened
21:36.9 foobar2000.exe 2860 QueryBasicInformationFile C:\Program Files (x86)\Winamp SUCCESS CreationTime: 25/12/2009 22:36:53, LastAccessTime: 25/12/2009 22:37:49, LastWriteTime: 25/12/2009 22:37:49, ChangeTime: 25/12/2009 22:37:49, FileAttributes: D
21:36.9 foobar2000.exe 2860 CloseFile C:\Program Files (x86)\Winamp SUCCESS
21:36.9 foobar2000.exe 2860 CreateFile C:\ SUCCESS Desired Access: Read Data/List Directory, Synchronize, Disposition: Open, Options: Directory, Synchronous IO Non-Alert, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened
21:36.9 foobar2000.exe 2860 QueryDirectory C:\Program Files (x86) SUCCESS Filter: Program Files (x86), 1: Program Files (x86)
21:36.9 foobar2000.exe 2860 CloseFile C:\ SUCCESS
21:36.9 foobar2000.exe 2860 CreateFile C:\Program Files (x86) SUCCESS Desired Access: Read Data/List Directory, Synchronize, Disposition: Open, Options: Directory, Synchronous IO Non-Alert, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened
21:36.9 foobar2000.exe 2860 QueryDirectory C:\Program Files (x86)\Winamp SUCCESS Filter: Winamp, 1: Winamp
21:36.9 foobar2000.exe 2860 CloseFile C:\Program Files (x86) SUCCESS
21:36.9 foobar2000.exe 2860 QueryOpen C:\Program Files (x86)\Winamp\Plugins\vis_avs.dll FAST IO DISALLOWED
21:36.9 foobar2000.exe 2860 CreateFile C:\Program Files (x86)\Winamp\Plugins\vis_avs.dll SUCCESS Desired Access: Read Attributes, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened
21:36.9 foobar2000.exe 2860 QueryBasicInformationFile C:\Program Files (x86)\Winamp\Plugins\vis_avs.dll SUCCESS CreationTime: 30/11/2009 17:28:30, LastAccessTime: 25/12/2009 22:36:56, LastWriteTime: 25/12/2009 22:37:14, ChangeTime: 25/12/2009 22:37:14, FileAttributes: A
21:36.9 foobar2000.exe 2860 CloseFile C:\Program Files (x86)\Winamp\Plugins\vis_avs.dll SUCCESS
I don't know if you'd like the complete Process Monitor output for more information? I'm not sure what it was you expected in a log file.