diff --git a/data/3rdparty/README.TXT b/data/3rdparty/README.md
similarity index 100%
rename from data/3rdparty/README.TXT
rename to data/3rdparty/README.md
diff --git a/data/CMakeLists.txt b/data/CMakeLists.txt
index 32ee36a48..6b3fd5a65 100644
--- a/data/CMakeLists.txt
+++ b/data/CMakeLists.txt
@@ -22,9 +22,9 @@ option(VL_INSTALL_DATA "Install sample data" OFF)
 if(VL_INSTALL_DATA)
 	if(VL_UNIX_INSTALL_MODE)
 		install(DIRECTORY 3rdparty font glsl images models text volume mol DESTINATION "share/vl/data/")
-		install(FILES README.TXT ztest.zip DESTINATION "share/vl/data/")
+		install(FILES README.md ztest.zip DESTINATION "share/vl/data/")
 	else()
 		install(DIRECTORY 3rdparty font glsl images models text volume mol DESTINATION "data/")
-		install(FILES README.TXT ztest.zip DESTINATION "data/")
+		install(FILES README.md ztest.zip DESTINATION "data/")
 	endif()
 endif()
diff --git a/data/README.TXT b/data/README.md
similarity index 100%
rename from data/README.TXT
rename to data/README.md
diff --git a/docs/README.TXT b/docs/README.md
similarity index 100%
rename from docs/README.TXT
rename to docs/README.md
diff --git a/src/external/README.TXT b/src/external/README.md
similarity index 98%
rename from src/external/README.TXT
rename to src/external/README.md
index 092e20092..a7daed8ee 100644
--- a/src/external/README.TXT
+++ b/src/external/README.md
@@ -1,22 +1,22 @@
-
- The content of this directory (except the CMakeLists.txt files) is not 
- part of Visualization Library and the copyright of each library belongs 
- to its respective author(s). Note that the following libraries might
- have been modified to suit Visualization Library needs.
- 
- +------------------+------------+-----------------------------+
- | LIBRARY          | DIRECTORY  | WEBSITE                     |
- +------------------+------------+-----------------------------+
- | GLEW library     | glew       | http://glew.sourceforge.net |
- | FreeType library | freetype   | http://www.freetype.org     |
- | zlib library     | zlib       | http://www.zlib.net         |
- | IJG's libjpeg    | jpeg-6b    | http://www.ijg.org          |
- | libpng library   | libpng     | http://www.libpng.org       |
- | libtiff library  | libtiff    | http://www.libtiff.org      |
- +------------------+------------+-----------------------------+
-
-Other credits:
-
-- Colin Plumb: MD5 message-digest algorithm; see "md5" directory.
-
-- Tanguy Fautré: Triangle stripping algorithm; see "tristripper" directory.
+
+ The content of this directory (except the CMakeLists.txt files) is not 
+ part of Visualization Library and the copyright of each library belongs 
+ to its respective author(s). Note that the following libraries might
+ have been modified to suit Visualization Library needs.
+ 
+ +------------------+------------+-----------------------------+
+ | LIBRARY          | DIRECTORY  | WEBSITE                     |
+ +------------------+------------+-----------------------------+
+ | GLEW library     | glew       | http://glew.sourceforge.net |
+ | FreeType library | freetype   | http://www.freetype.org     |
+ | zlib library     | zlib       | http://www.zlib.net         |
+ | IJG's libjpeg    | jpeg-6b    | http://www.ijg.org          |
+ | libpng library   | libpng     | http://www.libpng.org       |
+ | libtiff library  | libtiff    | http://www.libtiff.org      |
+ +------------------+------------+-----------------------------+
+
+Other credits:
+
+- Colin Plumb: MD5 message-digest algorithm; see "md5" directory.
+
+- Tanguy Fautré: Triangle stripping algorithm; see "tristripper" directory.
diff --git a/src/gui/vlCocoa/README.TXT b/src/gui/vlCocoa/README.md
similarity index 100%
rename from src/gui/vlCocoa/README.TXT
rename to src/gui/vlCocoa/README.md