diff --git a/base-camps.shtml b/bcamps.htm
similarity index 98%
rename from base-camps.shtml
rename to bcamps.htm
index e54334e4e..1d2022860 100644
--- a/base-camps.shtml
+++ b/bcamps.htm
@@ -67,7 +67,7 @@ flood!</td>
 <p><hr>
 <!-- LINKS -->
 <p><ul>
-<li>Back to <a href="main-index.shtml">Main Index</a>
+<li>Back to <a href="infodx.htm">Main Index</a>
 <li>CUCC's <a href="tcamps.htm">Top Camps</a><br>
 </ul>
 
diff --git a/index.shtml b/index.htm
similarity index 94%
rename from index.shtml
rename to index.htm
index d7ccf08cc..eb4bbefec 100644
--- a/index.shtml
+++ b/index.htm
@@ -14,7 +14,7 @@ Club expeditions to Austria.
 
 <p align=center>
 <a href="intro.shtml">Introduction</a> |
-<a href="main-index.shtml">Main index</a> |
+<a href="infodx.htm">Main index</a> |
 <a href="indxal.htm">Cave index</a> |
 <a href="handbook/index.htm">Expedition handbook</a><br>
 <a href="pubs.htm">Published reports</a> |
diff --git a/main-index.shtml b/infodx.htm
similarity index 97%
rename from main-index.shtml
rename to infodx.htm
index 3f4d6deda..11b16a18b 100644
--- a/main-index.shtml
+++ b/infodx.htm
@@ -21,7 +21,7 @@ href="pubs.htm">Publications index</a>, as are the log book accounts.
 <ul>
 <li><a href="areas.htm">Area/subarea descriptions</a>
 <li><a href="folk/author.htm">Authors</a> of material here (for contacts, see Feedback)
-<li><a href="base-camps.shtml">Base camps</a>
+<li><a href="bcamps.htm">Base camps</a>
 <li><a href="indxal.htm">Cave Descriptions Index</a>
 <li><a href="copyit.htm">Copyright info</a>
 <li><a href="dplong.htm">Deep and Long Caves list</a>
@@ -31,7 +31,7 @@ href="pubs.htm">Publications index</a>, as are the log book accounts.
 <li><a href="geolog.htm">Geological outline</a>
 <li>Expedition <a href="handbook/index.htm">Handbook</a>
 <li><a href="tcamps.htm">High camps</a> used by CUCC
-<li>The Expo <a href="index.shtml">Home page</a>
+<li>The Expo <a href="index.htm">Home page</a>
 <li><a href="dclaim.htm">Independent visitors' info</a>
 <li><a href="intro.shtml">Introduction</a>
 <li><b>Kaninchenh&ouml;hle</b>
@@ -160,7 +160,7 @@ to info for each expedition in the years:
 <hr>
 <!-- LINKS -->
 <ul>
-<li>Back to <a href="index.shtml">Expedition home page</a>
+<li>Back to <a href="index.htm">Expedition home page</a>
 <li>Back to <a href="http://cucc.survex.com/">CUCC home page</a>
 </ul>
 
diff --git a/intro.shtml b/intro.shtml
index 2a8ec772b..4264a47f6 100644
--- a/intro.shtml
+++ b/intro.shtml
@@ -33,7 +33,7 @@ annual expedition has become largely a CUCC undergraduate-organised affair,
 but with many exCS (ex-Cambridge Speleologists) still taking part.
 
 <p>Although originally we camped at <span lang="de-at">Altaussee,</span> by
-the lake, since 1983 <a href="base-camps.shtml">Base Camp</a> has been at
+the lake, since 1983 <a href="bcamps.htm">Base Camp</a> has been at
 <span lang="de-at">Gasthof Staud'n'Wirt,</span> by the
 <span lang="de-at">Grundlsee</span> road from <span lang="de-at">Bad
 Aussee,</span> where we are annually made very welcome by
@@ -96,7 +96,7 @@ Back to <a href="../index.htm">CUCC Home page</a><br>
 <img alt="&gt;" src="../icons/lists/0.png">
 <b>Main Indices:</b><br>
 <img alt="---&gt;" src="../icons/lists/1.png">
-<a href="main-index.shtml"><b>Index</b> to Expo</a> information pages<br>
+<a href="infodx.htm"><b>Index</b> to Expo</a> information pages<br>
 <img alt="---&gt;" src="../icons/lists/1.png">
 <a href="areas.htm">Description of CUCC's area</a> and split to subareas<br>
 <img alt="---&gt;" src="../icons/lists/1.png">
diff --git a/piclinks/potato-hut.shtml b/piclinks/potato-hut.shtml
index cf94a8f48..4358ad29e 100644
--- a/piclinks/potato-hut.shtml
+++ b/piclinks/potato-hut.shtml
@@ -16,9 +16,9 @@ The Potato Hut
 <p><hr>
 
 <p><ul>
-<li><a href="../base-camps.shtml">Base Camps</a>
+<li><a href="../bcamps.htm">Base Camps</a>
 <li><a href="../fester.htm">Expo festering guide</a>
-<li>Back to <a href="../main-index.shtml">Main Index</a>
+<li>Back to <a href="../infodx.htm">Main Index</a>
 </ul>
 
 </body>
diff --git a/qm.shtml b/qm.shtml
index bd77cae78..30492b412 100644
--- a/qm.shtml
+++ b/qm.shtml
@@ -50,7 +50,7 @@ explorers have different ideas - one man's "A-lead" may be another's "C-lead"
 
 <p><HR>
 <p><ul>
-<li><a href="main-index.shtml">Back to main index page</a>
+<li><a href="infodx.htm">Back to main index page</a>
 </ul>
 
 </body>
diff --git a/smkridge/204/204.shtml b/smkridge/204/204.shtml
index c00b8a4f7..5c777e729 100644
--- a/smkridge/204/204.shtml
+++ b/smkridge/204/204.shtml
@@ -76,7 +76,7 @@ in preparation and will be available in time for the 2002 expedition.
 <p><HR>
 <!-- LINKS -->
 <p><ul>
-<li><a href="../../index.shtml">Back to Expedition Home page</a>
+<li><a href="../../index.htm">Back to Expedition Home page</a>
 <li><a href="../../indxal.htm">Full Index</A> by cave</a>
 <li><a href="../../areas.htm">Other areas</A>
 <li><a href="../index.htm#204"><SPAN lang=de-at>Schwarzmooskogel</SPAN> ridge area index</A>