| F | Fortran Source Code | Developer Files | 8 | 4 |
| F# | F# Source Code File |
Developer Files
| 1 | 1 |
| F#+A | RagTime Classic File | Data Files | 1 | 1 |
| F#+D | RagTime Classic File |
Data Files
| 1 | 1 |
| F&F | Netmino File | Uncommon Files | 1 | 1 |
| F01 | HEC-RAS Flow File |
Data Files
| 1 | 1 |
| F03 | Fortran Source Code |
Developer Files
| 6 | 2 |
| F04 | HEC-RAS Flow File |
Data Files
| 2 | 2 |
| F05 | HEC-GeoRAS Flow Data |
Data Files
| 1 | 1 |
| F06 | MS-DOS Screen Text 6 Pixels Height Font | Font Files | 1 | 1 |
| F07 | DOS 7-pixel Screen Font |
Font Files
| 1 | 1 |
| F0A | Unknown File Type |
Uncommon Files
| 1 | 1 |
| F11 | DOS Screen Text 11 Pixels Height Font File |
Font Files
| 1 | 1 |
| F12 | DOS Screen Text 12 Pixel Height Font File |
Font Files
| 1 | 1 |
| F13 | MS-DOS Screen Text 13 Pixels Height Font |
Font Files
| 1 | 1 |
| F15 | Embird Embroidery Software Data |
Data Files
| 1 | 1 |
| F1C | Unknown File Type |
Uncommon Files
| 1 | 1 |
| F2 | Biosflash File |
Data Files
| 1 | 1 |
| F2F | Byteworx FMEA Exported Data File |
Data Files
| 1 | 1 |
| F2K | Freecell 2000 File | Game Files | 1 | 1 |
| F2R | Farandoyle Linear Module File | Audio Files | 1 | 1 |
| F3 | FLASH BIOS File |
Uncommon Files
| 1 | 1 |
| F32 | Raw 32-Bit Audio File |
Audio Files
| 1 | 1 |
| F3D | Fusion 3D Design | 3D Image Files | 2 | 2 |
| F3F | Crazy Machines Font File |
Font Files
| 1 | 1 |
| F3G | GIGABYTE BIOS Update |
Data Files
| 2 | 1 |
| F3LA | Corel Texture File | Graphic Files | 1 | 1 |
| F3R | Farandoyle Blocked Module File |
Audio Files
| 1 | 1 |
| F3Z | Fusion 360 Distributed Design File |
3D Image Files
| 1 | 1 |
| F40 | PDP-10 FORTRAN-4 Compiler Source File |
Developer Files
| 2 | 1 |
| F4A | Adobe Flash Protected Audio File |
Audio Files
| 2 | 1 |
| F4B | Adobe Flash MP4 Audio eBook File |
Audio Files
| 1 | 1 |
| F4F | Adobe HTTP Dynamic Streaming Segment |
Data Files
| 2 | 1 |
| F4G | GIGABYTE BIOS Update |
Data Files
| 2 | 1 |
| F4M | Adobe Flash Media Manifest File |
3D Image Files
| 1 | 1 |
| F4P | Adobe Flash Protected Media File | Video Files | 2 | 1 |
| F4V | Flash MP4 Video File |
Video Files
| 1 | 1 |
| F4X | Adobe HTTP Dynamic Streaming Index File |
Video Files
| 1 | 1 |
| F6 | Fonts File |
Font Files
| 2 | 1 |
| F64 | Raw 64-Bit Audio File |
Audio Files
| 1 | 1 |
| F6G | GIGABYTE BIOS Update |
Data Files
| 2 | 1 |
| F7 | Fonts File |
Font Files
| 2 | 1 |
| F77 | Fortran 77 Language Source File |
Developer Files
| 1 | 1 |
| F8 | Fonts File |
Font Files
| 2 | 1 |
| F90 | Fortran 90 Source Code File |
Developer Files
| 2 | 1 |
| F95 | Fortran 95 Source Code File |
Developer Files
| 2 | 1 |
| F99 | Flow File |
Uncommon Files
| 1 | 1 |
| FA | FASTA Formatted Sequence File |
Data Files
| 7 | 1 |
| FAC | FACE Graphic File | Raster Image Files | 6 | 4 |
| FACE | FACE Graphic File |
Raster Image Files
| 2 | 1 |
| FACES | FacesServlet Page |
Developer Files
| 1 | 1 |
| FACT | EIAS ElectricImage 3D File |
3D Image Files
| 1 | 1 |
| FACTOR | Factor Language Source File |
Developer Files
| 1 | 1 |
| FAD | Office File Attribute Database File | Text Files | 1 | 1 |
| FAF | Find Any File Search Description |
Data Files
| 1 | 1 |
| FAFF | Professional Calc Spreadsheet File | Spreadsheet Files | 1 | 1 |
| FAM | The Sims Family Data Game File |
Game Files
| 2 | 2 |
| FAMILYFILE | Reunion Family Tree File |
Data Files
| 1 | 1 |
| FAN | Form•Z Animation File | CAD Files | 2 | 2 |
| FAP | ACD FotoAngelo Project | Settings Files | 1 | 1 |
| FAQ | Frequently Asked Questions Document |
3D Image Files
| 27 | 1 |
| FAR | The Sims Archive File |
Game Files
| 6 | 2 |
| FAS | Compiled Fast-Load AutoLISP File | Executable Files | 9 | 3 |
| FAST | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| FASTA | FASTA Sequence File |
Data Files
| 9 | 2 |
| FASTQ | FASTQ Format |
Data Files
| 5 | 1 |
| FAT | Zinf Theme File |
Settings Files
| 1 | 1 |
| FAV | Microsoft Outlook Bar-Shortcut |
Settings Files
| 1 | 1 |
| FAX | Now Contact Fax Template | Page Layout Files | 5 | 2 |
| FAZ | DeskMate Generic Character Data File |
Data Files
| 1 | 1 |
| FB | Slim! Compressed Archive | Compressed Files | 2 | 2 |
| FB! | FlashGet Incomplete Download | Temporary Files | 1 | 1 |
| FB2 | FictionBook 2.0 File | eBook Files | 4 | 1 |
| FB5 | FlowBiz Integrator File |
Data Files
| 1 | 1 |
| FBA | Mamew20 Data File |
Uncommon Files
| 1 | 1 |
| FBC | Family Tree Maker For DOS Backup File | Backup Files | 1 | 1 |
| FBF | Free Backup Fix Backup File |
Data Files
| 1 | 1 |
| FBI | Total Annihilation Main Unit Definition File |
Game Files
| 1 | 1 |
| FBK | Microsoft Dynamics NAV Backup File |
Backup Files
| 3 | 3 |
| FBL | CADfix Command Level Log File |
Text Files
| 2 | 2 |
| FBM | Fuzzy Bitmap Image |
Raster Image Files
| 4 | 3 |
| FBP | WxFormBuilder Project |
Developer Files
| 2 | 1 |
| FBR | FlashBack Screen Recording |
Video Files
| 3 | 3 |
| FBS | Fastbid Plan Sheet |
Data Files
| 1 | 1 |
| FBU | FEBE Firefox Backup File |
Backup Files
| 2 | 1 |
| FBV | FinalBuilder Persistent Variables File |
Data Files
| 1 | 1 |
| FBW | HP Recovery Manager Backup File |
Backup Files
| 1 | 1 |
| FC | FirstClass Settings File |
Settings Files
| 4 | 4 |
| FC2 | Poser Face Pose File |
3D Image Files
| 1 | 1 |
| FC7 | FastCAD Version 7 Drawing |
Data Files
| 1 | 1 |
| FCA | Omnis Web Client File |
Data Files
| 1 | 1 |
| FCB | FAAST Builder Data |
Data Files
| 1 | 1 |
| FCC | Forms Credential Collector File |
Settings Files
| 1 | 1 |
| FCD | Virtual CD Format | Disk Image Files | 7 | 4 |
| FCE | ForeUI Custom Element File |
Developer Files
| 3 | 3 |
| FCF | Final Draft Converter File |
Text Files
| 2 | 1 |
| FCG | FastCGI Script File |
Uncommon Files
| 2 | 1 |
| FCH | Gaussian Checkpoint File |
Data Files
| 1 | 1 |
| FCHK | Gaussian Checkpoint |
Data Files
| 1 | 1 |
| FCI | EROSION 3D Inflow Table |
Data Files
| 1 | 1 |
of 5 
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