ffastun.ffa , .ffo , .ffl, what are these and can I delete them?

I read somewhere they're government spying techniques, what are they exactly and can I delete them?
kriss71Asked:
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aioudineCommented:
It'a FindFast idex files
Find Fast index files are located at the topmost level of the hierarchy of the 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 with the base name of Ffastun and the following extensions. This index file extension
 Indicates this type of file
 
 
..ffl Document list
..ffx Index
..ffo Cache of document properties such as Author and Title
..ffa Status file

Because you create and maintain index files through the Find Fast control panel, you do not normally need to work with these files directly. Do not attempt to copy, move, or change the attributes of these file types.

 If you need to delete or move a set of indexed folders, delete the index first through the Find Fast control panel, and then recreate the index after you move the folders.

The index files typically require about 7 percent of the space of the text component of the documents they index, or about 1 percent to 3 percent of the total document size.
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