| ldb | Lingoes Dictionary Backup |
| ldb | Microsoft Access Database Lock |
| ldb | Sybase PowerDesigner Logical Data Model Backup |
| ldb | TrueVector Log Database |
| ldc | Steuer 2001 Data File |
| ldd | Laser Dispatch Data File |
| ldd | LEGO Digital Designer Data |
| lde | Veeam Explorer Exported Data |
| ldf | Enotate Layered Data Format |
| ldf | LDAP Data Interchange Format File |
| ldf | Lingoes Dictionary Source |
| ldf | LinkOne List Definition Data |
| ldf | LogPlot LogDesign File |
| ldf | Microsoft SQL Server Transaction Log |
| ldfx | LogPlot LogDesign XML File |
| ldg | TIBCO Business Studio Ledger Data |
| ldi | LDAP Data Interchange Format File |
| ldif | LDAP Data Interchange Format File |
| ldk | Larson Davis System 824 Firmware Authorization Data |
| ldl | Paradox Delivered Library |
| ldm | Sybase PowerDesigner Logical Data Model |
| ldml | Adobe GoLive LDML Data |
| ldmt | Likno Drop-Down Menu Trees Data |
| ldp | Active Directory Exported LDAP Data |
| ldp | Lingoes Dictionary Data |
| ldr | eSignal Hotlist Data |
| lds | Laser Dispatch Script |
| lds | VSE/VSAM Linear Data Set |
| ldsx | STAAD Advanced Concrete Design Cases and Combinations Data |
| ldt | EULUMDAT File |
