Can't find Minecraft jar if path contains spaces

[okamt]

[main/ERROR] (FabricLoader/Mixin) Error encountered during mixin config postInit step 'mixins.mm.json' from mod 'mm': Failed to find Minecraft jar from jar:file://<snip>/.minecraft/.fabric/remappedJars/minecraft-1.0.0-beta.7.3-0.14.24-babric.1/client-intermediary.jar!/ (calculated file://<snip>/.minecraft/.fabric/remappedJars/minecraft-1.0.0-beta.7.3-0.14.24-babric.1/client-intermediary.jar)
java.lang.RuntimeException: Failed to find Minecraft jar from jar:file://<snip>/.minecraft/.fabric/remappedJars/minecraft-1.0.0-beta.7.3-0.14.24-babric.1/client-intermediary.jar!/ (calculated file://<snip>/.minecraft/.fabric/remappedJars/minecraft-1.0.0-beta.7.3-0.14.24-babric.1/client-intermediary.jar)
	at me.modmuss50.optifabric.mod.OptifabricSetup.getLaunchMinecraftJar(OptifabricSetup.java:382) ~[optibabric-1.2.jar:?]
	at me.modmuss50.optifabric.mod.OptifabricSetup.getMinecraftJar(OptifabricSetup.java:338) ~[optibabric-1.2.jar:?]
	at me.modmuss50.optifabric.mod.OptifabricSetup.getRemappedOptifine(OptifabricSetup.java:158) ~[optibabric-1.2.jar:?]

This error only happens when there is a space in the path to the Minecraft jar. It shows the space character as %20.