diff --git a/Src/1541fs.cpp b/Src/1541fs.cpp
index 767f81c..303a397 100644
--- a/Src/1541fs.cpp
+++ b/Src/1541fs.cpp
@@ -194,7 +194,6 @@ uint8 FSDrive::open_file(int channel, const uint8 *name, int name_len)
 	}
 
 	// Open file
-#ifndef __riscos__
 	if (chdir(dir_path))
 		set_error(ERR_NOTREADY);
 	else if ((file[channel] = fopen(plain_name, mode_str)) != NULL) {
@@ -202,26 +201,8 @@ uint8 FSDrive::open_file(int channel, const uint8 *name, int name_len)
 			read_char[channel] = fgetc(file[channel]);
 	} else
 		set_error(ERR_FILENOTFOUND);
-	chdir(AppDirPath);
-#else
-	{
-	  char fullname[NAMEBUF_LENGTH];
-
-  	  // On RISC OS make a full filename
-	  sprintf(fullname,"%s.%s",dir_path,plain_name);
-	  if ((file[channel] = fopen(fullname, mode)) != NULL)
-	  {
-	    if (mode == FMODE_READ || mode == FMODE_M)
-	    {
-	      read_char[channel] = fgetc(file[channel]);
-	    }
-	  }
-	  else
-	  {
-	    set_error(ERR_FILENOTFOUND);
-	  }
-	}
-#endif
+	if (chdir(AppDirPath) < 0)
+		set_error(ERR_NOTREADY);
 
 	return ST_OK;
 }
@@ -303,11 +284,6 @@ uint8 FSDrive::open_directory(int channel, const uint8 *pattern, int pattern_len
 	char str[NAMEBUF_LENGTH];
 	char *p, *q;
 	int i;
-	int filemode;
-	int filetype;
-	bool wildflag;
-
-#ifndef __riscos__
 	DIR *dir;
 	struct dirent *de;
 	struct stat statbuf;
@@ -355,9 +331,11 @@ uint8 FSDrive::open_directory(int channel, const uint8 *pattern, int pattern_len
 		if (match(ascii_pattern, de->d_name)) {
 
 			// Get file statistics
-			chdir(dir_path);
+			if (chdir(dir_path) < 0)
+				continue;
 			stat(de->d_name, &statbuf);
-			chdir(AppDirPath);
+			if (chdir(AppDirPath) < 0)
+				continue;
 
 			// Clear line with spaces and terminate with null byte
 			memset(buf, ' ', 31);
@@ -403,61 +381,6 @@ uint8 FSDrive::open_directory(int channel, const uint8 *pattern, int pattern_len
 		// Get next directory entry
 		de = readdir(dir);
 	}
-#else
-	dir_full_info di;
-	dir_env de;
-	unsigned char c;
-
-	// Much of this is very similar to the original
-	if ((pattern[0] == '0') && (pattern[1] == 0)) {pattern++;}
-
-	// Concatenate dir_path and ascii_pattern in buffer ascii_pattern ==> read subdirs!
-	strcpy(ascii_pattern,dir_path); i = strlen(ascii_pattern); ascii_pattern[i++] = '.'; ascii_pattern[i] = 0;
-	convert_filename(pattern, ascii_pattern + i, &filemode, &filetype, &wildflag);
-	p = ascii_pattern + i; q = p;
-	do {c = *q++; if (c == '.') p = q;} while (c >= 32);
-	*(p-1) = 0;  // separate directory-path and ascii_pattern
-	if ((uint8)(*p) < 32) {*p = '*'; *(p+1) = 0;}
-
-	// We don't use tmpfile() -- problems involved!
-	DeleteFile(RO_TEMPFILE);	// first delete it, if it exists
-	if ((file[channel] = fopen(RO_TEMPFILE,"wb+")) == NULL)
-		return(ST_OK);
-	de.offset = 0; de.buffsize = NAMEBUF_LENGTH; de.match = p;
-
-	// Create directory title - copied from above
-	p = &buf[8];
-	for (i=0; i<16 && dir_title[i]; i++)
-		*p++ = conv_to_64(dir_title[i], false);
-	fwrite(buf, 1, 32, file[channel]);
-
-	do {
-		de.readno = 1;
-		if (ReadDirNameInfo(ascii_pattern,&di,&de) != NULL)
-			de.offset = -1;
-		else if (de.readno > 0) {	// don't have to check for match here
-			memset(buf,' ',31); buf[31] = 0;	// most of this: see above
-			p = buf; *p++ = 0x01; *p++ = 0x01;
-			i = (di.length + 254) / 254; *p++ = i & 0xff; *p++ = (i>>8) & 0xff;
-			p++;
-			if (i < 10)
-				*p++ = ' ';
-			if (i < 100)
-				*p++ = ' ';
-			strcpy(str, di.name);
-			*p++ = '\"'; q = p;
-			for (i=0; (i<16 && str[i]); i++)
-				*q++ = conv_to_64(str[i], true);
-			*q++ = '\"'; p += 18;
-			if ((di.otype & 2) == 0) {
-				*p++ = 'P'; *p++ = 'R'; *p++ = 'G';
-			} else {
-				*p++ = 'D'; *p++ = 'I'; *p++ = 'R';
-			}
-			fwrite(buf, 1, 32, file[channel]);
-		}
-	} while (de.offset != -1);
-#endif
 
 	// Final line
 	fwrite("\001\001\0\0BLOCKS FREE.             \0\0", 1, 32, file[channel]);
@@ -466,10 +389,8 @@ uint8 FSDrive::open_directory(int channel, const uint8 *pattern, int pattern_len
 	rewind(file[channel]);
 	read_char[channel] = fgetc(file[channel]);
 
-#ifndef __riscos
 	// Close directory
 	closedir(dir);
-#endif
 
 	return ST_OK;
 }