| lpn | LVPLAN Data |
| lpr | Amazon Kindle Position Information |
| lps | Bryce 7 Leaf Shape |
| lpsx | LARSA 4D Section Database |
| lpt | PDP-10 Printer Output Data |
| lpt | TrialDirector Load Data |
| lpv | Lasergraph DSP Laser Show Preview Data |
| lpw | IRIS Laserforms Lforms Data |
| lpx | LaTeXPiX Script |
| lqa | LabQuest 2 Automatic Update |
| lqf | LeechFTP Saved Queue |
| lqm | Liquid Audio Master Data |
| lqn | CoWolf Layered Queuing Network Data |
| lqp | Liquid Audio Player Passport Data |
| lqs | Libvirt Qemu Saved Data |
| lqu | LeapFTP Queue Data |
| lra | HPE LoadRunner Analyzed Results |
| lrcat | Adobe Photoshop Lightroom Catalog |
| lrcat-data | Adobe Photoshop Lightroom Catalog |
| lrcx | KwMusic Data |
| lrdata | Adobe Photoshop Lightroom Data |
| lrdb | Adobe Photoshop Lightroom 1.0 Database |
| lrl | SmartWare Local Resource Library |
| lrm | Microsoft Encarta Class Server Learning Resource Module |
| lrpreview | Adobe Photoshop Lightroom Preview |
| lrq | GEAR License Request File |
| lrr | HPE LoadRunner Raw Results |
| lrreg | Adobe Photoshop Lightroom License Data |
| lrs | Corel WordPerfect Language Data |
| lrs | Daylon Leveller Rendition Style |
