@@ -, +, @@ 
- variant #2 (approach JG02)
--- a/dlight.remote.impl/nbproject/project.xml	
+++ a/dlight.remote.impl/nbproject/project.xml	
@@ -85,7 +85,7 @@ 
                     <build-prerequisite/>
                     <compile-dependency/>
                     <run-dependency>
-                        <specification-version>7.36</specification-version>
+                        <specification-version>7.56</specification-version>
                     </run-dependency>
                 </dependency>
                 <dependency>
--- a/dlight.remote.impl/src/org/netbeans/modules/remote/impl/fs/RemoteFileObjectBase.java	
+++ a/dlight.remote.impl/src/org/netbeans/modules/remote/impl/fs/RemoteFileObjectBase.java	
@@ -554,6 +554,9 @@ 
     
     @Override
     public Object getAttribute(String attrName) {
+        if (attrName.equals("default-line-separator")) {
+            return "\n"; // NOI18N
+        }
         if (attrName.equals("isRemoteAndSlow")) { // NOI18N
             return Boolean.TRUE;
         }
--- a/editor.lib/apichanges.xml	
+++ a/editor.lib/apichanges.xml	
@@ -107,6 +107,22 @@ 
     <!-- ACTUAL CHANGES BEGIN HERE: -->
 
     <changes>
+         <change id="default-line-separator">
+            <summary>Provides default line separator</summary>
+            <version major="3" minor="18.1"/>
+            <date day="23" month="12" year="2011"/>
+            <author login="alexvsimon"/>
+            <compatibility addition="yes" binary="compatible" source="compatible" semantic="compatible" deprecation="no" deletion="no" modification="no"/>
+            <description>
+                <p>
+                    Defines name of default line separator property 
+                    <code>DEFAULT_LINE_SEPARATOR_PROP</code>.
+                    If property <code>getProperty(DEFAULT_LINE_SEPARATOR_PROP)</code>, it will be used instead <code>System.getProperty("line.separator")</code>.
+                </p>
+            </description>
+            <class package="org.netbeans.editor" name="BaseDocument"/>
+            <issue number="199534"/>
+        </change>
 
         <change id="deprecating-formatting">
             <summary>Deprecating old formatting API</summary>
--- a/editor.lib/nbproject/project.properties	
+++ a/editor.lib/nbproject/project.properties	
@@ -42,7 +42,7 @@ 
 
 javac.compilerargs=-Xlint:unchecked
 javac.source=1.6
-spec.version.base=3.18.0
+spec.version.base=3.18.1
 is.autoload=true
 
 javadoc.arch=${basedir}/arch.xml
--- a/editor.lib/nbproject/project.xml	
+++ a/editor.lib/nbproject/project.xml	
@@ -141,7 +141,7 @@ 
                     <build-prerequisite/>
                     <compile-dependency/>
                     <run-dependency>
-                        <specification-version>7.13</specification-version>
+                        <specification-version>7.56</specification-version>
                     </run-dependency>
                 </dependency>
                 <dependency>
--- a/editor.lib/src/org/netbeans/editor/BaseDocument.java	
+++ a/editor.lib/src/org/netbeans/editor/BaseDocument.java	
@@ -165,6 +165,11 @@ 
      */
     public static final String WRITE_LINE_SEPARATOR_PROP = "write-line-separator"; // NOI18N
 
+    /** Default line separator property for writing content into files. If not set
+     * the platform default line separator is used.
+     */
+    public static final String DEFAULT_LINE_SEPARATOR_PROP = "default-line-separator"; // NOI18N
+
     /** File name property */
     public static final String FILE_NAME_PROP = "file-name"; // NOI18N
 
@@ -1383,10 +1388,13 @@ 
                 throw new BadLocationException("BaseDocument.read()", pos); // NOI18N
             }
             ReadWriteBuffer buffer = ReadWriteUtils.read(reader);
-            if (!inited) { // Fill line-separator properties
+            if (!inited) { // Fill line-separator properties               
                 String lineSeparator = ReadWriteUtils.findFirstLineSeparator(buffer);
                 if (lineSeparator == null) {
-                    lineSeparator = ReadWriteUtils.getSystemLineSeparator();
+                    lineSeparator = (String) getProperty(BaseDocument.DEFAULT_LINE_SEPARATOR_PROP);
+                    if (lineSeparator == null) {
+                        lineSeparator = ReadWriteUtils.getSystemLineSeparator();
+                    }
                 }
                 putProperty(BaseDocument.READ_LINE_SEPARATOR_PROP, lineSeparator);
             }
@@ -1428,7 +1436,7 @@ 
             }
             String lineSeparator = (String) getProperty(BaseDocument.WRITE_LINE_SEPARATOR_PROP);
             if (lineSeparator == null) {
-                lineSeparator = (String) getProperty(BaseDocument.READ_LINE_SEPARATOR_PROP);
+                lineSeparator = (String) getProperty(BaseDocument.DEFAULT_LINE_SEPARATOR_PROP);
                 if (lineSeparator == null) {
                     lineSeparator = ReadWriteUtils.getSystemLineSeparator();
                 }
--- a/editor/nbproject/project.xml	
+++ a/editor/nbproject/project.xml	
@@ -167,7 +167,7 @@ 
                     <build-prerequisite/>
                     <compile-dependency/>
                     <run-dependency>
-                        <specification-version>7.55</specification-version>
+                        <specification-version>7.56</specification-version>
                     </run-dependency>
                 </dependency>
                 <dependency>
--- a/editor/src/org/netbeans/modules/editor/EditorModule.java	
+++ a/editor/src/org/netbeans/modules/editor/EditorModule.java	
@@ -637,6 +637,10 @@ 
             
             final StyledDocument doc = ec.openDocument();
             final Reformat reformat = Reformat.get(doc);
+            String defaultLineSeparator = (String) file.getPrimaryFile().getAttribute(BaseDocument.DEFAULT_LINE_SEPARATOR_PROP);
+            if (defaultLineSeparator != null) {
+                doc.putProperty(BaseDocument.DEFAULT_LINE_SEPARATOR_PROP, defaultLineSeparator);
+            }
             
             reformat.lock();
             
@@ -658,7 +662,12 @@ 
                 
             } finally {
                 reformat.unlock();
-                doc.putProperty(BaseDocument.READ_LINE_SEPARATOR_PROP, ReadWriteUtils.getSystemLineSeparator());
+                defaultLineSeparator = (String) doc.getProperty(BaseDocument.DEFAULT_LINE_SEPARATOR_PROP);
+                if (defaultLineSeparator != null) {
+                    doc.putProperty(BaseDocument.READ_LINE_SEPARATOR_PROP, defaultLineSeparator);
+                } else {
+                    doc.putProperty(BaseDocument.READ_LINE_SEPARATOR_PROP, ReadWriteUtils.getSystemLineSeparator());
+                }
                 ec.saveDocument();
             }
             
--- a/openide.filesystems/apichanges.xml	
+++ a/openide.filesystems/apichanges.xml	
@@ -49,6 +49,24 @@ 
         <apidef name="filesystems">Filesystems API</apidef>
     </apidefs>
     <changes>
+         <change id="default-line-separator">
+            <api name="filesystems"/>
+            <summary>Provides default line separator</summary>
+            <version major="7" minor="7.56"/>
+            <date day="23" month="12" year="2011"/>
+            <author login="alexvsimon"/>
+            <compatibility addition="yes" binary="compatible" source="compatible" semantic="compatible" deprecation="no" deletion="no" modification="no"/>
+            <description>
+                <p>
+                    File object can provide default line separator if it differs from <code>System.getProperty("line.separator")</code>.
+                    <a href="@TOP@/architecture-summary.html#answer-arch-usecases">content of system filesystem</a> by
+                    Call <code>fo.getAttribute("default-line-separator")</code> return string with default line separator.
+                    Default line separator will be used for new files.
+                </p>
+            </description>
+            <class package="org.openide.filesystems" name="Repository"/>
+            <issue number="199534"/>
+        </change>
         <change id="FileObject.revert">
             <api name="filesystems"/>
             <summary>Introduced <code>FileObject.revert</code></summary>
--- a/openide.filesystems/manifest.mf	
+++ a/openide.filesystems/manifest.mf	
@@ -2,5 +2,5 @@ 
 OpenIDE-Module: org.openide.filesystems
 OpenIDE-Module-Localizing-Bundle: org/openide/filesystems/Bundle.properties
 OpenIDE-Module-Layer: org/openide/filesystems/resources/layer.xml
-OpenIDE-Module-Specification-Version: 7.55
+OpenIDE-Module-Specification-Version: 7.56
 
--- a/openide.loaders/nbproject/project.xml	
+++ a/openide.loaders/nbproject/project.xml	
@@ -122,7 +122,7 @@ 
                     <build-prerequisite/>
                     <compile-dependency/>
                     <run-dependency>
-                        <specification-version>7.55</specification-version>
+                        <specification-version>7.56</specification-version>
                     </run-dependency>
                 </dependency>
                 <dependency>
--- a/openide.loaders/src/org/openide/text/DataEditorSupport.java	
+++ a/openide.loaders/src/org/openide/text/DataEditorSupport.java	
@@ -125,6 +125,11 @@ 
     /** error manager for CloneableEditorSupport logging and error reporting */
     static final Logger ERR = Logger.getLogger("org.openide.text.DataEditorSupport"); // NOI18N
 
+    /** Default line separator property for writing content into files. If not set
+     * the platform default line separator is used.
+     */
+    private static final String DEFAULT_LINE_SEPARATOR_PROP = "default-line-separator"; // NOI18N
+
     /** Which data object we are associated with */
     private final DataObject obj;
     /** listener to associated node's events */
@@ -433,7 +438,7 @@ 
     @Override
     protected StyledDocument createStyledDocument (EditorKit kit) {
         StyledDocument doc = super.createStyledDocument (kit);
-            
+  
         // set document name property
         doc.putProperty(Document.TitleProperty,
             FileUtil.getFileDisplayName(obj.getPrimaryFile())
@@ -480,6 +485,7 @@ 
             c = FileEncodingQuery.getEncoding(this.getDataObject().getPrimaryFile());
         }
         final FileObject fo = this.getDataObject().getPrimaryFile();
+        doc.putProperty(DEFAULT_LINE_SEPARATOR_PROP, fo.getAttribute(DEFAULT_LINE_SEPARATOR_PROP));
         final Reader r;
         if (warnedEncodingFiles.contains(fo)) {
             r = new InputStreamReader (stream, c);