diff --git a/src/MNH/open_prc_files.f90 b/src/MNH/open_prc_files.f90
index 9bc8fd683fffe96e521b361e09ab097422c66702..52124869b62a05bac87768bc0bb002951cdc3e1e 100644
--- a/src/MNH/open_prc_files.f90
+++ b/src/MNH/open_prc_files.f90
@@ -220,23 +220,9 @@ CALL POSNAM(IPRE_REAL1,'NAM_FILE_NAMES',GFOUND,ILUOUT0)
 IF (GFOUND) READ(UNIT=IPRE_REAL1,NML=NAM_FILE_NAMES)
 CINIFILE_n = CINIFILE
 !
-ILEN = LEN_TRIM(HATMFILE)
-IF (ILEN>0) THEN
-  YFILE='                            '
-  YFILE(1:ILEN) = HATMFILE(1:ILEN)
-  HATMFILE = '                            '
-  HATMFILE(1:ILEN) = YFILE(1:ILEN)
-END IF
 WRITE(ILUOUT0,*) 'HATMFILE= ', HATMFILE
 !
-ILEN = LEN_TRIM(HCHEMFILE)
-IF (ILEN>0) THEN
-  YFILE='                            '
-  YFILE(1:ILEN) = HCHEMFILE(1:ILEN)
-  HCHEMFILE = '                            '
-  HCHEMFILE(1:ILEN) = YFILE(1:ILEN)
-  IF (HCHEMFILE==HATMFILE) HCHEMFILE=''
-END IF
+IF (HCHEMFILE==HATMFILE) HCHEMFILE=''
 IF (LEN_TRIM(HCHEMFILE)>0 .AND. HATMFILETYPE/='GRIBEX') THEN
 !callabortstop
   CALL PRINT_MSG(NVERB_FATAL,'GEN','OPEN_PRC_FILES',&
@@ -244,35 +230,14 @@ IF (LEN_TRIM(HCHEMFILE)>0 .AND. HATMFILETYPE/='GRIBEX') THEN
 END IF
 WRITE(ILUOUT0,*) 'HCHEMFILE=', HCHEMFILE
 !
-ILEN = LEN_TRIM(HCAMSFILE)
-IF (ILEN>0) THEN
-  YFILE='                            '
-  YFILE(1:ILEN) = HCAMSFILE(1:ILEN)
-  HCAMSFILE = '                            '
-  HCAMSFILE(1:ILEN) = YFILE(1:ILEN)
-END IF
 WRITE(ILUOUT0,*) 'HCAMSFILE=', HCAMSFILE
 !
-ILEN = LEN_TRIM(HSURFFILE)
-IF (ILEN>0) THEN
-  YFILE='                            '
-  YFILE(1:ILEN) = HSURFFILE(1:ILEN)
-  HSURFFILE = '                            '
-  HSURFFILE(1:ILEN) = YFILE(1:ILEN)
-ELSE
-  HSURFFILE = HATMFILE
+IF ( LEN_TRIM( HSURFFILE ) == 0 ) THEN
+  HSURFFILE     = HATMFILE
   HSURFFILETYPE = HATMFILETYPE
 END IF
 WRITE(ILUOUT0,*) 'HSURFFILE=', HSURFFILE
 !
-ILEN = LEN_TRIM(HPGDFILE)
-IF (ILEN>0) THEN
-  YFILE='                            '
-  YFILE(1:ILEN) = HPGDFILE(1:ILEN)
-  HPGDFILE = '                            '
-  HPGDFILE(1:ILEN) = YFILE(1:ILEN)
-END IF
-!
 CINIFILEPGD_n = HPGDFILE
 IF (LEN_TRIM(HPGDFILE)==0) THEN
 !  IF (HATMFILETYPE=='MESONH') THEN