Info-Tips are enabled on a per-file type basis by adding FragExt's FMTID & PID to the InfoTip value of a file type's registry class key. FragExt offers 6 different tips.
 
For all tips, the FMTID is: {242ED098-D606-4FA8-9DDE-89AEDFE4EAD7}
 

PID	Tip Type
1	Fragments
3	Extents
5	Clusters
7	Size on Disk
9	Data Streams
11	Percent on Disk

 
The combined format for each tip, on Windows 2000, is {FMTID},PID
 
The combined format for each tip, on Windows XP & Windows 2003, is {FMTID}PID
 
So if you want to show tips on all files that do not have a registered info-tip, you would do the following.

1. Run regedit.exe
2. Expand the HKEY_CLASSES_ROOT key
3. Select the * key
4. Create a new String value named InfoTip if one does not exist
5. Add those tips you want FragExt to display to the value of InfoTip. For instance, on my machine I already have an InfoTip value and it is set to

   prop:Type;Write;Size

   I want to add fragments to the display, so on Windows XP & Windows 2003, I change the value to

   prop:Type;Write;Size;{242ED098-D606-4FA8-9DDE-89AEDFE4EAD7}3

   On Windows 2000, this would be

   prop:Type;Write;Size;{242ED098-D606-4FA8-9DDE-89AEDFE4EAD7},3

Note that the string is prefixed by the text prop: (note the trailing colin). This is required by Windows. Also note that tips are separated by ; (semi-colins). This is also required by windows. Finally note that Windows 2000 a , (comma) is required between the FMTID and the PID.
 
You can apply the same steps to any other file-extension class with the exception of those that have the following sub-key

ShellEx\{00021500-0000-0000-c000-000000000046}

These file types use an extended info-tip format and override the method that FragExt uses.