diff --git a/parasitics/Parasitics.tcl b/parasitics/Parasitics.tcl
index 1a6b8160..8a9b52a1 100644
--- a/parasitics/Parasitics.tcl
+++ b/parasitics/Parasitics.tcl
@@ -66,7 +66,7 @@ proc_redirect read_spef {
   set delete_after_reduce [info exists flags(-delete_after_reduce)]
   set quiet [info exists flags(-quiet)]
   set save [info exists flags(-save)]
-  set filename $args
+  set filename [file nativename [lindex $args 0]]
   return [read_spef_cmd $filename $instance $min_max $increment \
 	    $pin_cap_included $keep_coupling_caps $coupling_reduction_factor \
 	    $reduce_to $delete_after_reduce $quiet]
diff --git a/sdf/Sdf.tcl b/sdf/Sdf.tcl
index 865005a1..19415606 100644
--- a/sdf/Sdf.tcl
+++ b/sdf/Sdf.tcl
@@ -30,7 +30,7 @@ proc_redirect read_sdf {
     keys {-path -corner -analysis_type -type -min_type -max_type -cond_use} \
     flags {-unescaped_dividers -incremental_only}
   check_argc_eq1 "read_sdf" $args
-  set filename $args
+  set filename [file nativename [lindex $args 0]]
   set path ""
   if [info exists keys(-path)] {
     set path $keys(-path)
@@ -202,7 +202,7 @@ proc_redirect write_sdf {
     flags {-gzip -no_timestamp -no_version}
   check_argc_eq1 "write_sdf" $args
   set corner [parse_corner keys]
-  set filename $args
+  set filename [file nativename [lindex $args 0]]
   set divider "/"
   if [info exists keys(-divider)] {
     set divider $keys(-divider)
diff --git a/tcl/Cmds.tcl b/tcl/Cmds.tcl
index 957f5f8b..ca9819c7 100644
--- a/tcl/Cmds.tcl
+++ b/tcl/Cmds.tcl
@@ -1973,7 +1973,7 @@ proc write_path_spice { args } {
     flags {}
 
   if { [info exists keys(-spice_directory)] } {
-    set spice_dir [file_expand_tilde $keys(-spice_directory)]
+    set spice_dir [file nativename $keys(-spice_directory)]
     if { ![file exists $spice_dir] } {
       sta_error 496 "Directory $spice_dir not found."
     }
@@ -1988,7 +1988,7 @@ proc write_path_spice { args } {
   }
 
   if { [info exists keys(-lib_subckt_file)] } {
-    set lib_subckt_file [file_expand_tilde $keys(-lib_subckt_file)]
+    set lib_subckt_file [file nativename $keys(-lib_subckt_file)]
     if { ![file readable $lib_subckt_file] } {
       sta_error 500 "-lib_subckt_file $lib_subckt_file is not readable."
     }
@@ -1997,7 +1997,7 @@ proc write_path_spice { args } {
   }
 
   if { [info exists keys(-model_file)] } {
-    set model_file [file_expand_tilde $keys(-model_file)]
+    set model_file [file nativename $keys(-model_file)]
     if { ![file readable $model_file] } {
       sta_error 502 "-model_file $model_file is not readable."
     }
@@ -2038,15 +2038,5 @@ proc write_path_spice { args } {
   }
 }
 
-proc file_expand_tilde { filename } {
-  global env
-
-  if { [string range $filename 0 1] == "~/" } {
-    return [file join $env(HOME) [string range $filename 2 end]]
-  } else {
-    return $filename
-  }
-}
-
 # sta namespace end.
 }
diff --git a/tcl/Liberty.tcl b/tcl/Liberty.tcl
index ee320f45..f18d3404 100644
--- a/tcl/Liberty.tcl
+++ b/tcl/Liberty.tcl
@@ -26,7 +26,7 @@ proc_redirect read_liberty {
     flags {-min -max -no_latch_infer}
   check_argc_eq1 "read_liberty" $args
 
-  set filename [file nativename $args]
+  set filename [file nativename [lindex $args 0]]
   set corner [parse_corner keys]
   set min_max [parse_min_max_all_flags flags]
   set infer_latches [expr ![info exists flags(-no_latch_infer)]]
diff --git a/tcl/Sdc.tcl b/tcl/Sdc.tcl
index 6dfe7a5b..ce3caadc 100644
--- a/tcl/Sdc.tcl
+++ b/tcl/Sdc.tcl
@@ -33,7 +33,7 @@ proc_redirect read_sdc {
 
   check_argc_eq1 "read_sdc" $args
   set echo [info exists flags(-echo)]
-  set filename [lindex $args 0]
+  set filename [file nativename [lindex $args 0]]
   source_ $filename $echo 0
 }
 
@@ -52,7 +52,7 @@ proc_redirect source {
   }
   set echo [info exists flags(-echo)]
   set verbose [info exists flags(-verbose)]
-  set filename [lindex $args 0]
+  set filename [file nativename [lindex $args 0]]
   source_ $filename $echo $verbose
 }
 
diff --git a/verilog/Verilog.tcl b/verilog/Verilog.tcl
index 7bbd2072..63763b37 100644
--- a/verilog/Verilog.tcl
+++ b/verilog/Verilog.tcl
@@ -33,7 +33,7 @@ proc write_verilog { args } {
   set sort [info exists flags(-sort)]
   set include_pwr_gnd [info exists flags(-include_pwr_gnd)]
   check_argc_eq1 "write_verilog" $args
-  set filename $args
+  set filename [file nativename [lindex $args 0]]
   write_verilog_cmd $filename $sort $include_pwr_gnd $remove_cells
 }