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diff --git a/src/extension/system.h b/src/extension/system.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * This is file is kind of the junk file.  Basically everything that
+ * didn't fit in one of the other well defined areas, well, it's now
+ * here.  Which is good in someways, but this file really needs some
+ * definition.  Hopefully that will come ASAP.
+ *
+ * Authors:
+ *   Ted Gould <ted@gould.cx>
+ *
+ * Copyright (C) 2002-2004 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_EXTENSION_SYSTEM_H__
+#define INKSCAPE_EXTENSION_SYSTEM_H__
+
+#include <glibmm/ustring.h>
+
+class SPDocument;
+
+namespace Inkscape {
+
+namespace Extension {
+class Extension;
+class Print;
+
+namespace Implementation {
+class Implementation;
+}
+
+/**
+ * Used to distinguish between the various invocations of the save dialogs (and thus to determine
+ * the file type and save path offered in the dialog)
+ */
+enum FileSaveMethod {
+    FILE_SAVE_METHOD_SAVE_AS,
+    FILE_SAVE_METHOD_SAVE_COPY,
+    FILE_SAVE_METHOD_EXPORT,
+    // Fallback for special cases (e.g., when saving a document for the first time or after saving
+    // it in a lossy format)
+    FILE_SAVE_METHOD_INKSCAPE_SVG,
+    // For saving temporary files; we return the same data as for FILE_SAVE_METHOD_SAVE_AS
+    FILE_SAVE_METHOD_TEMPORARY,
+};
+
+SPDocument *open(Extension *key, gchar const *filename);
+void save(Extension *key, SPDocument *doc, gchar const *filename,
+          bool check_overwrite, bool official,
+          Inkscape::Extension::FileSaveMethod save_method);
+Print *get_print(gchar const *key);
+void build_from_file(gchar const *filename);
+void build_from_mem(gchar const *buffer, Implementation::Implementation *in_imp);
+
+/**
+ * Determine the desired default file extension depending on the given file save method.
+ * The returned string is guaranteed to be non-empty.
+ *
+ * @param method the file save method of the dialog
+ * @return the corresponding default file extension
+ */
+Glib::ustring get_file_save_extension (FileSaveMethod method);
+
+/**
+ * Determine the desired default save path depending on the given FileSaveMethod.
+ * The returned string is guaranteed to be non-empty.
+ *
+ * @param method the file save method of the dialog
+ * @param doc the file's document
+ * @return the corresponding default save path
+ */
+Glib::ustring get_file_save_path (SPDocument *doc, FileSaveMethod method);
+
+/**
+ * Write the given file extension back to prefs so that it can be used later on.
+ *
+ * @param extension the file extension which should be written to prefs
+ * @param method the file save method of the dialog
+ */
+void store_file_extension_in_prefs (Glib::ustring extension, FileSaveMethod method);
+
+/**
+ * Write the given path back to prefs so that it can be used later on.
+ *
+ * @param path the path which should be written to prefs
+ * @param method the file save method of the dialog
+ */
+void store_save_path_in_prefs (Glib::ustring path, FileSaveMethod method);
+
+} } /* namespace Inkscape::Extension */
+
+#endif /* INKSCAPE_EXTENSION_SYSTEM_H__ */
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :