john_dennis wrote on 12/12/2014, 8:59 PM
Two of my machines running Vegas Pro 13-428 on Windows 7 Professional use lowercase .mp4 extensions for the Mainconcept and Sony AVC/MVC render templates.

I even rendered to a USB drive that was formatted FAT.

I looked through Vegas Pro Options including Options / Internal and could find no reference that seemed to affect the case of the file extension.

My main system:
Motherboard: ASUS ProArt Z790-CREATOR WIFI
CPU: Intel Core i9-13900K - Core i9 13th Gen Raptor Lake 24-Core (8P+16E) P-core Base Frequency: 3.0 GHz E-core Base Frequency: 2.2 GHz LGA 1700 125W Intel UHD Graphics 770 Desktop Processor - BX8071513900K
GPU: Currently intel on-die video adapter
RAM: CORSAIR Vengeance 64GB (2 x 32GB) 288-Pin PC RAM DDR5 5600 (PC5 44800) Desktop Memory Model CMK64GX5M2B5600C40
Disk O/S & Programs: WD Black SN850 NVMe SSD WDS100T1X0E - SSD - 1 TB - PCIe 4.0 x4 (NVMe)
Disk Active Projects: 1TB & 2TB WD BLACK SN750 NVMe Internal PCI Express 3.0 x4 Solid State Drives
Disk Other: WD Ultrastar/Hitachi Hard Drives: WDBBUR0080BNC-WRSN, HGST HUH728080ALE600, 724040ALE640, HDS3020BLA642
Case: LIAN LI PC-90 Black Aluminum ATX Full Tower Case
CPU cooling: CORSAIR - iCUE H115i RGB PRO XT 280mm Radiator CPU Liquid Cooling System
Power supply: SeaSonic SS-750KM3 750W 80 PLUS GOLD Certified Full Modular Active PFC Power Supply
Drive Bay: Kingwin KF-256-BK 2.5" and 3.5" Trayless Hot Swap Rack with USB 3
Sound card: Realtek S1220A on motherboard. Recording done on another system.
Primary Monitor: ASUS ProArt 31.5" 1440p HDR10 Monitor PA328QV
O/S: Windows 10 Pro 10.0.19045 Build 19045
Camera: Sony RX10 Model IV

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Kit wrote on 12/12/2014, 9:22 PM
Thanks for the reply, John. Other programs on this PC use lowercase - I can't figure out why Vegas is stuck in uppercase but it's annoying.
Chienworks wrote on 12/13/2014, 6:38 AM
All of my cameras name every file in all uppercase. Bugs the snot out of me.

Windows' bulk renaming feature will allow me to change the whole lot of them to a lowercase name in one step, but it keeps the extension uppercase, even when i've retyped it as lower. Why???
videoITguy wrote on 12/13/2014, 8:40 AM
the extension case upper lower should have nothing to do with Sony Vegas. It's all about your OS and file association. Buried deep in the association that began when the file type became first clocked - i.e., that is now in your registry as that style. If you can't find the interface, then you edit the registry.