This may be of some help. I actually can't stand the MS Fast Finder. Never had a use for it but this link or text copy may help you decide what to do with it.
LINK
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OFF97: Overview of Find Fast Indexer
The information in this article applies to:
Microsoft Office 97 for Windows
Summary
The Find Fast Indexer is a utility that builds indexes to speed finding documents from the Open dialog box in Microsoft Office programs and from Microsoft Outlook. When you install Microsoft Office, a shortcut to Find Fast is placed in your startup program group.
More Information
You can open the Find Fast Control Panel icon to create additional indexes (for example, on a network drive), delete indexes, and set other options. Although you can use Find Fast in the Control Panel, Find Fast indexes Office documents automatically and requires no user interaction.
By default, Find Fast creates a single index on each hard disk on your computer. Note that Find Fast does not automatically index files on removable disk media. However, you may create multiple indexes on a single drive, especially on shared or network drives. You can do this but you cannot create indexes that overlap. For example, if a Find Fast index exists on drive C, you cannot create an additional index for files in the My Documents folder on drive C. To create an index of My Documents, first delete the index for drive C through the Find Fast Control Panel icon.
Description of the Index Files
Find Fast index files are located in the folder in the topmost level in the hierarchy of indexed folders. For example, if you index an entire drive, the index file is located at the root of that drive. Find Fast index files are hidden files. These index files and their functions are listed in the following table.
File Name Type of File
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Ffastun.ffl Document list
Ffastun.ffx Index
Ffastun.ffo Cache of document properties
(for example, the author and title)
Ffastun0.ffa Status file
Because you create and maintain index files through Find Fast in the Control Panel, it's not necessary to work with these files directly.
NOTE: Do not attempt to copy, move, or change the attributes of these file types. If you must delete or move a set of indexed folders, first delete the index through the Find Fast Control Panel icon, and then recreate the index after you move the folders.