Add a skeleton sparkleshare:// protocol handler on the mac

SparkleShare/Mac/SparkleShareInviteOpener.app/Contents/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+<key>CFBundleURLTypes</key>
+<array>
+	<dict>
+		<key>CFBundleURLName</key>
+		<string>SparkleShareInviteOpener</string>
+		<key>CFBundleURLSchemes</key>
+		<array>
+			<string>sparkleshare</string>
+		</array>
+	</dict>
+</array>
+
+  <key>CFBundleIdentifier</key>
+  <string>org.sparkleshare.SparkleShareInviteOpener</string>
+	<key>CFBundleAllowMixedLocalizations</key>
+	<true/>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+	<key>CFBundleExecutable</key>
+	<string>applet</string>
+	<key>CFBundleIconFile</key>
+	<string>applet</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>SparkleShareInviteOpen</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleSignature</key>
+	<string>aplt</string>
+	<key>LSMinimumSystemVersionByArchitecture</key>
+	<dict>
+		<key>x86_64</key>
+		<string>10.6</string>
+	</dict>
+	<key>LSRequiresCarbon</key>
+	<true/>
+	<key>WindowState</key>
+	<dict>
+		<key>dividerCollapsed</key>
+		<false/>
+		<key>eventLogLevel</key>
+		<integer>-1</integer>
+		<key>name</key>
+		<string>ScriptWindowState</string>
+		<key>positionOfDivider</key>
+		<real>333</real>
+		<key>savedFrame</key>
+		<string>3 178 602 597 0 0 1280 778 </string>
+		<key>selectedTabView</key>
+		<string>result</string>
+	</dict>
+</dict>
+</plist>

SparkleShare/Mac/SparkleShareInviteOpener.app/Contents/PkgInfo

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+APPLaplt

SparkleShare/Mac/SparkleShareInviteOpener.app/Contents/Resources/description.rtfd/TXT.rtf

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+{\rtf1\ansi\ansicpg1252\cocoartf1138\cocoasubrtf230
+{\fonttbl}
+{\colortbl;\red255\green255\blue255;}
+}