| Extension Name | Extension Type | Category | Dev.Company | File Format |
|---|---|---|---|---|
| .73K File Extension | TI-73 Application | Executable | Texas Instruments | Binary |
| .89K File Extension | TI-89 Application | Executable | Texas Instruments | Binary |
| .73U File Extension | TI-73 Explorer Operating System File | System | Texas Instruments | Binary |
| .8CK File Extension | TI-83 and TI-84 Plus Application File | Executable | Texas Instruments | Unknown |
| .8CU File Extension | TI-84 Plus C Operating System File | System | Texas Instruments | Unknown |
| .8CI File Extension | TI-84 Plus C Pic Vars Format | Raster Image | Texas Instruments | Unknown |
| .8CA File Extension | TI-84 Plus C Image Var Format | Raster Image | Texas Instruments | Unknown |
| .73B File Extension | TI-73 Backup File | Backup | Texas Instruments | Binary |
| .8XV File Extension | TI-83/84 Plus Variable File | Data | Texas Instruments | Binary |
| .8XU File Extension | TI-83 and TI-84 Plus Operating System File | System | Texas Instruments | Binary |
| .8XK File Extension | TI-83 Plus Application Upgrade File | Data | Texas Instruments | Binary |
| .8XI File Extension | TI-83/84 Plus Picture File | Raster Image | Texas Instruments | Binary |
| .8XG File Extension | TI-83/84 Plus Group File | Data | Texas Instruments | Unknown |
| .73C File Extension | TI-73 Constant File | Data | Texas Instruments | Unknown |
| .73L File Extension | TI-73 Data List File | Data | Texas Instruments | Unknown |
| .8XS File Extension | TI-83/84 Plus String File | Data | Texas Instruments | Binary |
| .C2U File Extension | Texas Instruments CBL 2 OS File | Misc | Texas Instruments | Binary |
| .TNSP File Extension | TI-Nspire PublishView Document | Misc | Texas Instruments | Binary |
| .TNS File Extension | TI-Nspire Document | Developer | Texas Instruments | Binary |
| .TIPROGRAM File Extension | TI-Basic Program File | Developer | Texas Instruments | Binary |
| .Z80 File Extension | TI-83 and 84 Plus Calculator File | Misc | Texas Instruments | Unknown |
| .8XP File Extension | TI-83 Plus Calculator File | Misc Files | Texas Instruments | Unknown |
| .83P File Extension | TI-83 Calculator File | Misc Files | Texas Instruments | Unknown |
| .73I File Extension | TI-73 Screenshot File | Raster Image Files | Texas Instruments | Binary |
| .TIG File Extension | TI Connect Backup File | Backup | Texas Instruments | Binary |