diff --git a/namd/README.md b/namd/README.md
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@@ -189,19 +189,19 @@ the appropriate binary format used by the memory optimised build.
 
 This is a 2×2×2 replication of the original STMV dataset from the official NAMD site. The system contains roughly 8 million atoms. 
 
-Download test Case A [https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseA.tar.xz](https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseA.tar.xz)
+Download test Case A [https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseA.tar.gz](https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseA.tar.gz)
 
 **B) Test Case B: STMV.28M **
 
 This is a 3×3×3 replication of the original STMV dataset from the official NAMD site, created during PRACE-2IP project. The system contains roughly 28 million atoms and is expected to scale efficiently up to few tens of thousands x86 cores.
 
-Download test Case B [https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseB.tar.xz](https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseB.tar.xz)
+Download test Case B [https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseB.tar.gz](https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseB.tar.gz)
 
 **C) Test Case C: STMV.210M **
 
 This is a 5×6×7 replication of the original STMV dataset from the official NAMD site. The system contains roughly 210 million atoms and is expected to scale efficiently up to more than hundred thousand recent x86 cores.
 
-Download test Case C [https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseC.tar.xz](https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseC.tar.xz)
+Download test Case C [https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseC.tar.gz](https://repository.prace-ri.eu/ueabs/NAMD/2.2/NAMD_TestCaseC.tar.gz)
 
 ## Performance