diff --git a/cypress/fixtures/swh:1:dir:cd19126d815470b28919d64b2a8e6a3e37f900dd.tar.gz b/cypress/fixtures/swh_1_dir_cd19126d815470b28919d64b2a8e6a3e37f900dd.tar.gz
rename from cypress/fixtures/swh:1:dir:cd19126d815470b28919d64b2a8e6a3e37f900dd.tar.gz
rename to cypress/fixtures/swh_1_dir_cd19126d815470b28919d64b2a8e6a3e37f900dd.tar.gz
diff --git a/cypress/fixtures/swh:1:rev:1c480a4573d2a003fc2630c21c2b25829de49972.git.tar b/cypress/fixtures/swh_1_rev_1c480a4573d2a003fc2630c21c2b25829de49972.git.tar
rename from cypress/fixtures/swh:1:rev:1c480a4573d2a003fc2630c21c2b25829de49972.git.tar
rename to cypress/fixtures/swh_1_rev_1c480a4573d2a003fc2630c21c2b25829de49972.git.tar
diff --git a/cypress/integration/vault.spec.js b/cypress/integration/vault.spec.js
--- a/cypress/integration/vault.spec.js
+++ b/cypress/integration/vault.spec.js
@@ -200,9 +200,9 @@
 
     // Stub response to the vault API to simulate archive download
     cy.intercept('GET', this.vaultFetchDirectoryUrl, {
-      fixture: `${this.directory}.tar.gz`,
+      fixture: `${this.directory.replace(/:/g, '_')}.tar.gz`,
       headers: {
-        'Content-disposition': `attachment; filename=${this.directory}.tar.gz`,
+        'Content-disposition': `attachment; filename=${this.directory.replace(/:/g, '_')}.tar.gz`,
         'Content-Type': 'application/gzip'
       }
     }).as('fetchCookedArchive');
@@ -285,9 +285,9 @@
 
     // Stub response to the vault API indicating to simulate archive download
     cy.intercept({url: this.vaultFetchRevisionUrl}, {
-      fixture: `${this.revision}.git.tar`,
+      fixture: `${this.revision.replace(/:/g, '_')}.git.tar`,
       headers: {
-        'Content-disposition': `attachment; filename=${this.revision}.git.tar`,
+        'Content-disposition': `attachment; filename=${this.revision.replace(/:/g, '_')}.git.tar`,
         'Content-Type': 'application/gzip'
       }
     }).as('fetchCookedArchive');
@@ -462,9 +462,9 @@
 
     // Stub response to the vault API to simulate archive download
     cy.intercept({url: this.vaultFetchDirectoryUrl}, {
-      fixture: `${this.directory}.tar.gz`,
+      fixture: `${this.directory.replace(/:/g, '_')}.tar.gz`,
       headers: {
-        'Content-disposition': `attachment; filename=${this.directory}.tar.gz`,
+        'Content-disposition': `attachment; filename=${this.directory.replace(/:/g, '_')}.tar.gz`,
         'Content-Type': 'application/gzip'
       }
     }).as('fetchCookedArchive');
@@ -495,9 +495,9 @@
 
     // Stub response to the vault API to simulate archive download
     cy.intercept({url: this.vaultFetchRevisionUrl}, {
-      fixture: `${this.revision}.git.tar`,
+      fixture: `${this.revision.replace(/:/g, '_')}.git.tar`,
       headers: {
-        'Content-disposition': `attachment; filename=${this.revision}.git.tar`,
+        'Content-disposition': `attachment; filename=${this.revision.replace(/:/g, '_')}.git.tar`,
         'Content-Type': 'application/gzip'
       }
     }).as('fetchCookedArchive');
diff --git a/swh/web/api/views/vault.py b/swh/web/api/views/vault.py
--- a/swh/web/api/views/vault.py
+++ b/swh/web/api/views/vault.py
@@ -84,7 +84,7 @@
 
         Then to extract the cooked directory in the current one, use::
 
-            $ tar xvf path/to/swh:1:*.tar.gz
+            $ tar xvf path/to/swh_1_*.tar.gz
 
         :param string swhid: the object's SWHID
 
@@ -189,7 +189,9 @@
     )
     fname = "{}.tar.gz".format(swhid)
     response = HttpResponse(res, content_type="application/gzip")
-    response["Content-disposition"] = "attachment; filename={}".format(fname)
+    response["Content-disposition"] = "attachment; filename={}".format(
+        fname.replace(":", "_")
+    )
     return response
 
 
@@ -246,7 +248,7 @@
         Then to import the revision in the current directory, use::
 
             $ git init
-            $ zcat path/to/swh:1:rev:*.gitfast.gz | git fast-import
+            $ zcat path/to/swh_1_rev_*.gitfast.gz | git fast-import
             $ git checkout HEAD
 
         :param string swhid: the revision's permanent identifiers
@@ -351,7 +353,9 @@
     )
     fname = "{}.gitfast.gz".format(swhid)
     response = HttpResponse(res, content_type="application/gzip")
-    response["Content-disposition"] = "attachment; filename={}".format(fname)
+    response["Content-disposition"] = "attachment; filename={}".format(
+        fname.replace(":", "_")
+    )
     return response
 
 
@@ -404,7 +408,7 @@
 
         Then to import the revision in the current directory, use::
 
-            $ tar -xf path/to/swh:1:rev:*.git.tar
+            $ tar -xf path/to/swh_1_rev_*.git.tar
             $ git clone swh:1:rev:*.git new_repository
 
         (replace ``swh:1:rev:*`` with the SWHID of the requested revision)
@@ -486,5 +490,7 @@
     )
     fname = "{}.git.tar".format(swhid)
     response = HttpResponse(res, content_type="application/gzip")
-    response["Content-disposition"] = "attachment; filename={}".format(fname)
+    response["Content-disposition"] = "attachment; filename={}".format(
+        fname.replace(":", "_")
+    )
     return response