Excalibur_V1.19_Mod_Support_GPJ_Build_3.zip is a release file of the Minecraft resource pack Excalibur Mod Support, made for Minecraft 1.19.3, 1.19.4-Snapshot, 1.19.4, 1.19-Snapshot, 1.19.2, 1.19.1, 1.19, 1.19.3-Snapshot. It was published on May 3, 2023 and is 6.7 MB in size. For the full description, screenshots and every other version, visit the Excalibur Mod Support resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.