diff --git a/libs/main/io_devices/pibinarylog.cpp b/libs/main/io_devices/pibinarylog.cpp
index aba778c9..d00b59ac 100644
--- a/libs/main/io_devices/pibinarylog.cpp
+++ b/libs/main/io_devices/pibinarylog.cpp
@@ -156,7 +156,7 @@ bool PIBinaryLog::openDevice() {
 
 
 bool PIBinaryLog::closeDevice() {
-	stopThreadedRead();
+	stopAndWait();
 	pausemutex.unlock();
 	logmutex.unlock();
 	moveIndex(-1);
diff --git a/libs/main/io_devices/pidir.cpp b/libs/main/io_devices/pidir.cpp
index 0016647c..d950dec1 100644
--- a/libs/main/io_devices/pidir.cpp
+++ b/libs/main/io_devices/pidir.cpp
@@ -160,6 +160,16 @@ PIDir & PIDir::cleanPath() {
 PIString PIDir::relative(const PIString & path) const {
 	PIDir td(path);
 	PIStringList dl(absolutePath().split(separator)), pl(td.absolutePath().split(separator)), rl;
+	auto checkPath = [](PIStringList & path) {
+		if (path.isEmpty()) return;
+		if (path[0].size() >= 2) {
+			if (path[0][0].isAlpha() && path[0][1] == ':') {
+				path[0][0] = path[0][0].toUpper();
+			}
+		}
+	};
+	checkPath(dl);
+	checkPath(pl);
 	// piCout << pl << "rel to" << dl;
 	while (!dl.isEmpty() && !pl.isEmpty()) {
 		if (dl.front() != pl.front()) break;
diff --git a/libs/main/io_devices/pifile.cpp b/libs/main/io_devices/pifile.cpp
index 0978276d..950dc208 100644
--- a/libs/main/io_devices/pifile.cpp
+++ b/libs/main/io_devices/pifile.cpp
@@ -153,6 +153,16 @@ PIString PIFile::FileInfo::dir() const {
 }
 
 
+bool PIFile::FileInfo::isAbsolute() const {
+	if (path.isEmpty()) return false;
+	if (path[0] == '/') return true;
+	if (path.size() >= 2) {
+		if (path[0].isAlpha() && path[1] == ':') return true;
+	}
+	return false;
+}
+
+
 PIFile::PIFile(): PIIODevice() {}
 
 
diff --git a/libs/main/io_devices/pifile.h b/libs/main/io_devices/pifile.h
index af572ef3..0adc4d7b 100644
--- a/libs/main/io_devices/pifile.h
+++ b/libs/main/io_devices/pifile.h
@@ -179,6 +179,10 @@ public:
 		//! \~english Returns if Hidden flag set
 		//! \~russian Возвращает установлен ли флаг Hidden
 		bool isHidden() const { return flags[Hidden]; }
+
+		//! \~english Returns if path is absolute
+		//! \~russian Возвращает абсолютный ли путь
+		bool isAbsolute() const;
 	};
 
 
diff --git a/libs/main/types/pivaluetree.cpp b/libs/main/types/pivaluetree.cpp
index 49e5ce8b..e0b365c2 100644
--- a/libs/main/types/pivaluetree.cpp
+++ b/libs/main/types/pivaluetree.cpp
@@ -34,6 +34,7 @@
 const char PIValueTree::Attribute::hidden       [] = "hidden"       ;
 const char PIValueTree::Attribute::readOnly     [] = "readOnly"     ;
 const char PIValueTree::Attribute::isLabel      [] = "label"        ;
+const char PIValueTree::Attribute::grouping     [] = "grouping"     ;
 
 const char PIValueTree::Attribute::arrayType    [] = "arrayType"    ;
 const char PIValueTree::Attribute::arrayMinCount[] = "arrayMinCount";
diff --git a/libs/main/types/pivaluetree.h b/libs/main/types/pivaluetree.h
index 94e1264a..e7bd4b51 100644
--- a/libs/main/types/pivaluetree.h
+++ b/libs/main/types/pivaluetree.h
@@ -44,6 +44,7 @@ public:
 		static const char hidden       [];
 		static const char readOnly     [];
 		static const char isLabel      [];
+		static const char grouping     [];
 
 		static const char arrayType    [];
 		static const char arrayMinCount[];