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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .TBK | SumTotal Systems | Backup Files | ToolBook Project File | ToolBook | SumTotal Systems |
| .TCS | Lennert Ploeger | Backup Files | TreeComp Snapshot Data | TreeComp | Lennert Ploeger |
| .TDB | Backup Files | Android Thumbnail Cache | Google Android | ||
| .TDR | PO KSI | Backup Files | ArVid Tape Backup | ArVid | PO KSI |
| .TIG | Texas Instruments, Inc. | Backup Files | TI Connect Backup File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TIS | Acronis | Backup Files | True Image Script | Acronis True Image | Acronis |
| .TJF | Hewlett-Packard | Backup Files | VAXTPU Backup | OpenVMS | Hewlett-Packard |
| .TJL | Unknown Developer | Backup Files | VAXTPU Editor Backup File | Unknown Software | Unknown Developer |
| .TLD | The Eclipse Foundation | Backup Files | Tag Library Descriptor File | Notepad++ | Don Ho |
| .TLG | Intuit, Inc. | Backup Files | QuickBooks Transaction Log File | QuickBooks | Intuit, Inc. |
| .TMB | ARRIS | Backup Files | Timbuktu Pro Connection Document | Timbuktu | ARRIS |
| .TMP | Mozilla | Backup Files | General Temporary File | Internet Explorer | Microsoft Corporation |
| .TMR | Apimac | Backup Files | Apimac Timer Document | Apimac Timer | Apimac |
| .TRN | Microsoft Corporation | Backup Files | SQL Server Transaction Log Backup File | Microsoft SQL Server | Microsoft Corporation |
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