Files that contain the .fid file extension are most commonly associated with the Microsoft Windows Indexing Service. These FID files contain index files that have been created by the Windows indexing utility. The indexes contained in these files help the operating system perform search functions more efficiently.
Files that contain the .fid file extension also may contain database files that are referenced by the File Expander software. These files contain descriptions of the various file formats that are supported by the File Expander software application.
The .fid file extension is also used by Forensic Innovations applications and Bruker Aspect NMR data files.
Try a universal file viewer
File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.
If you have additional information about the FID file format or software that uses files with the FID suffix, please do get in touch - we would love hearing from you.