in server/src/jetbrains/buildServer/swabra/HandleProvider.java [78:82]
public GetPackageVersionResult tryGetPackageVersion(@NotNull final File toolPackage) {
final String toolPackageName = toolPackage.getName();
return ((toolPackage.isDirectory() && toolPackageName.equalsIgnoreCase(HANDLE_TOOL)) || (toolPackage.isFile() && toolPackageName.equalsIgnoreCase(HANDLE_EXE)))
? GetPackageVersionResult.version(mySingleToolVersion) : GetPackageVersionResult.error(toolPackage.getAbsolutePath() + " is not a valid " + HANDLE_TOOL + " package");
}