diff --git a/etk/etk.cpp b/etk/etk.cpp
index 041dede..ec77d71 100644
--- a/etk/etk.cpp
+++ b/etk/etk.cpp
@@ -58,13 +58,16 @@ void etk::init(int _argc, const char** _argv) {
 			if (_argc >= 1) {
 				TK_PRINT("    " << _argv[0] << " [options]");
 			}
+			TK_PRINT("        --etk-base-path=name  Change the default USERDATA: generic name");
 			/*
 			TK_PRINT("        --etk-log-lib=name:X  Set a library specific level:");
 			TK_PRINT("            name  Name of the library");
 			TK_PRINT("            X     Log level to set [0..6]");
 			*/
 			TK_PRINT("        -h/--help: this help");
-		} else if (data.startWith("--etk")) {
+		} else if (data.startWith("--etk-base-path=") == true) {
+			etk::forcePathUserData(etk::String(&data[16]));
+		} else if (data.startWith("--etk") == true) {
 			TK_ERROR("Can not parse the argument : '" << data << "'");
 		}
 	}
diff --git a/etk/os/FSNode.cpp b/etk/os/FSNode.cpp
index 0c4db29..045c54c 100644
--- a/etk/os/FSNode.cpp
+++ b/etk/os/FSNode.cpp
@@ -407,6 +407,18 @@ void etk::setArgZero(const etk::String& _val) {
 	etk::Vector<etk::String> elems = etk::split(_val, '/');
 	etk::initDefaultFolder(elems[elems.size()-1].c_str());
 }
+
+etk::String l_forceUSERDATA = "";
+void etk::forcePathUserData(const etk::String& _val) {
+	l_forceUSERDATA = _val;
+	if (l_forceUSERDATA == "") {
+		TK_TODO("Reset the USERDATA: to the default path ...");
+		return;
+	}
+	TK_INFO("Force the USERDATA: to '" << l_forceUSERDATA << "'");
+	baseFolderDataUser = l_forceUSERDATA;
+}
+
 /*
 	On Unixes with /proc really straight and realiable way is to:
 		readlink("/proc/self/exe", buf, bufsize) (Linux)
@@ -567,8 +579,10 @@ void etk::initDefaultFolder(const char* _applName) {
 			baseFolderData += etk::String(binaryName.begin()+1, binaryName.end()-4);
 			baseFolderData += "/";
 			
-			baseFolderDataUser  = binaryPath;
-			baseFolderDataUser += "/user/";
+			if (l_forceUSERDATA == "") {
+				baseFolderDataUser  = binaryPath;
+				baseFolderDataUser += "/user/";
+			}
 			
 			baseFolderCache  = binaryPath;
 			baseFolderCache += "/tmp/";
@@ -616,16 +630,18 @@ void etk::initDefaultFolder(const char* _applName) {
 					}
 				#endif
 			}
-			#if defined(__TARGET_OS__IOs)
-				baseFolderDataUser  = binaryPath;
-				baseFolderDataUser += "/../Documents/";
-				baseFolderDataUser = simplifyPath(baseFolderDataUser);
-			#else
-				baseFolderDataUser  = baseFolderHome;
-				baseFolderDataUser += "/.local/share/";
-				baseFolderDataUser += binaryName;
-				baseFolderDataUser += "/";
-			#endif
+			if (l_forceUSERDATA == "") {
+				#if defined(__TARGET_OS__IOs)
+					baseFolderDataUser  = binaryPath;
+					baseFolderDataUser += "/../Documents/";
+					baseFolderDataUser = simplifyPath(baseFolderDataUser);
+				#else
+					baseFolderDataUser  = baseFolderHome;
+					baseFolderDataUser += "/.local/share/";
+					baseFolderDataUser += binaryName;
+					baseFolderDataUser += "/";
+				#endif
+			}
 			#if defined(__TARGET_OS__IOs)
 				baseFolderCache  = binaryPath;
 				baseFolderCache += "/../tmp/";
diff --git a/etk/os/FSNode.hpp b/etk/os/FSNode.hpp
index 1469ab5..54ded94 100644
--- a/etk/os/FSNode.hpp
+++ b/etk/os/FSNode.hpp
@@ -42,6 +42,12 @@ namespace etk {
 	 * @param[in] _val First parameter.
 	 */
 	void setArgZero(const etk::String& _val);
+	/**
+	 * @brief Force the "USERDATA:" to an other path (not the default path).
+	 * @note this is called internaly to change the path with the generic cmd line intruction ... It is dangerous to do it in runtime (after start).
+	 * @param[in] _val user data basic path.
+	 */
+	void forcePathUserData(const etk::String& _val);
 	/**
 	 * @brief Simplify a path with all the complication that mean ".." or "///\//"
 	 * @param[in] _input Parth to simplify