Index: common/mptString.cpp
===================================================================
--- common/mptString.cpp	(revision 16910)
+++ common/mptString.cpp	(working copy)
@@ -357,18 +357,21 @@
 	switch(charset)
 	{
 #if defined(MPT_ENABLE_CHARSET_LOCALE)
-		case Charset::Locale:      return mpt::encode<Tdststring>(mpt::logical_encoding::locale, src); break;
+		case Charset::Locale:           return mpt::encode<Tdststring>(mpt::logical_encoding::locale, src); break;
 #endif
-		case Charset::UTF8:        return mpt::encode<Tdststring>(mpt::common_encoding::utf8, src); break;
-		case Charset::ASCII:       return mpt::encode<Tdststring>(mpt::common_encoding::ascii, src); break;
-		case Charset::ISO8859_1:   return mpt::encode<Tdststring>(mpt::common_encoding::iso8859_1, src); break;
-		case Charset::ISO8859_15:  return mpt::encode<Tdststring>(mpt::common_encoding::iso8859_15, src); break;
-		case Charset::CP850:       return mpt::encode<Tdststring>(mpt::common_encoding::cp850, src); break;
-		case Charset::CP437:       return mpt::encode<Tdststring>(mpt::common_encoding::cp437, src); break;
-		case Charset::CP437AMS:    return mpt::encode<Tdststring>(CharsetTableCP437AMS, src); break;
-		case Charset::CP437AMS2:   return mpt::encode<Tdststring>(CharsetTableCP437AMS2, src); break;
-		case Charset::Windows1252: return mpt::encode<Tdststring>(mpt::common_encoding::windows1252, src); break;
-		case Charset::Amiga:       return mpt::encode<Tdststring>(mpt::common_encoding::amiga, src); break;
+		case Charset::UTF8:             return mpt::encode<Tdststring>(mpt::common_encoding::utf8, src); break;
+		case Charset::ASCII:            return mpt::encode<Tdststring>(mpt::common_encoding::ascii, src); break;
+		case Charset::ISO8859_1:        return mpt::encode<Tdststring>(mpt::common_encoding::iso8859_1, src); break;
+		case Charset::ISO8859_15:       return mpt::encode<Tdststring>(mpt::common_encoding::iso8859_15, src); break;
+		case Charset::CP850:            return mpt::encode<Tdststring>(mpt::common_encoding::cp850, src); break;
+		case Charset::CP437:            return mpt::encode<Tdststring>(mpt::common_encoding::cp437, src); break;
+		case Charset::CP437AMS:         return mpt::encode<Tdststring>(CharsetTableCP437AMS, src); break;
+		case Charset::CP437AMS2:        return mpt::encode<Tdststring>(CharsetTableCP437AMS2, src); break;
+		case Charset::Windows1252:      return mpt::encode<Tdststring>(mpt::common_encoding::windows1252, src); break;
+		case Charset::Amiga:            return mpt::encode<Tdststring>(mpt::common_encoding::amiga, src); break;
+		case Charset::ISO8859_1_no_C1:  return mpt::encode<Tdststring>(mpt::common_encoding::iso8859_1_no_c1, src); break;
+		case Charset::ISO8859_15_no_C1: return mpt::encode<Tdststring>(mpt::common_encoding::iso8859_15_no_c1, src); break;
+		case Charset::Amiga_no_C1:      return mpt::encode<Tdststring>(mpt::common_encoding::amiga_no_c1, src); break;
 		case Charset::RISC_OS:     return mpt::encode<Tdststring>(mpt::common_encoding::riscos, src); break;
 	}
 	return Tdststring();
@@ -384,18 +387,21 @@
 	switch(charset)
 	{
 #if defined(MPT_ENABLE_CHARSET_LOCALE)
-		case Charset::Locale:      return mpt::decode<Tsrcstring>(mpt::logical_encoding::locale, src); break;
+		case Charset::Locale:           return mpt::decode<Tsrcstring>(mpt::logical_encoding::locale, src); break;
 #endif
-		case Charset::UTF8:        return mpt::decode<Tsrcstring>(mpt::common_encoding::utf8, src); break;
-		case Charset::ASCII:       return mpt::decode<Tsrcstring>(mpt::common_encoding::ascii, src); break;
-		case Charset::ISO8859_1:   return mpt::decode<Tsrcstring>(mpt::common_encoding::iso8859_1, src); break;
-		case Charset::ISO8859_15:  return mpt::decode<Tsrcstring>(mpt::common_encoding::iso8859_15, src); break;
-		case Charset::CP850:       return mpt::decode<Tsrcstring>(mpt::common_encoding::cp850, src); break;
-		case Charset::CP437:       return mpt::decode<Tsrcstring>(mpt::common_encoding::cp437, src); break;
-		case Charset::CP437AMS:    return mpt::decode<Tsrcstring>(CharsetTableCP437AMS, src); break;
-		case Charset::CP437AMS2:   return mpt::decode<Tsrcstring>(CharsetTableCP437AMS2, src); break;
-		case Charset::Windows1252: return mpt::decode<Tsrcstring>(mpt::common_encoding::windows1252, src); break;
-		case Charset::Amiga:       return mpt::decode<Tsrcstring>(mpt::common_encoding::amiga, src); break;
+		case Charset::UTF8:             return mpt::decode<Tsrcstring>(mpt::common_encoding::utf8, src); break;
+		case Charset::ASCII:            return mpt::decode<Tsrcstring>(mpt::common_encoding::ascii, src); break;
+		case Charset::ISO8859_1:        return mpt::decode<Tsrcstring>(mpt::common_encoding::iso8859_1, src); break;
+		case Charset::ISO8859_15:       return mpt::decode<Tsrcstring>(mpt::common_encoding::iso8859_15, src); break;
+		case Charset::CP850:            return mpt::decode<Tsrcstring>(mpt::common_encoding::cp850, src); break;
+		case Charset::CP437:            return mpt::decode<Tsrcstring>(mpt::common_encoding::cp437, src); break;
+		case Charset::CP437AMS:         return mpt::decode<Tsrcstring>(CharsetTableCP437AMS, src); break;
+		case Charset::CP437AMS2:        return mpt::decode<Tsrcstring>(CharsetTableCP437AMS2, src); break;
+		case Charset::Windows1252:      return mpt::decode<Tsrcstring>(mpt::common_encoding::windows1252, src); break;
+		case Charset::Amiga:            return mpt::decode<Tsrcstring>(mpt::common_encoding::amiga, src); break;
+		case Charset::ISO8859_1_no_C1:  return mpt::decode<Tsrcstring>(mpt::common_encoding::iso8859_1_no_c1, src); break;
+		case Charset::ISO8859_15_no_C1: return mpt::decode<Tsrcstring>(mpt::common_encoding::iso8859_15_no_c1, src); break;
+		case Charset::Amiga_no_C1:      return mpt::decode<Tsrcstring>(mpt::common_encoding::amiga_no_c1, src); break;
 		case Charset::RISC_OS:     return mpt::decode<Tsrcstring>(mpt::common_encoding::riscos, src); break;
 	}
 	return mpt::widestring();
Index: common/mptString.h
===================================================================
--- common/mptString.h	(revision 16910)
+++ common/mptString.h	(working copy)
@@ -69,6 +69,10 @@
 	Amiga,
 	RISC_OS,
 
+	ISO8859_1_no_C1,
+	ISO8859_15_no_C1,
+	Amiga_no_C1,
+
 #if defined(MPT_ENABLE_CHARSET_LOCALE)
 	Locale, // CP_ACP on windows, current C locale otherwise
 #endif // MPT_ENABLE_CHARSET_LOCALE
Index: src/mpt/string/types.hpp
===================================================================
--- src/mpt/string/types.hpp	(revision 16910)
+++ src/mpt/string/types.hpp	(working copy)
@@ -38,6 +38,9 @@
 	windows1252,
 	amiga,
 	riscos,
+	iso8859_1_no_c1,
+	iso8859_15_no_c1,
+	amiga_no_c1,
 };
 
 
Index: src/mpt/string_transcode/transcode.hpp
===================================================================
--- src/mpt/string_transcode/transcode.hpp	(revision 16910)
+++ src/mpt/string_transcode/transcode.hpp	(working copy)
@@ -43,27 +43,25 @@
 
 
 
-/*
-default 1:1 mapping
+
+// default 1:1 mapping
 inline constexpr char32_t CharsetTableISO8859_1[256] = {
-	0x0000,0x0001,0x0002,0x0003,0x0004,0x0005,0x0006,0x0007,0x0008,0x0009,0x000a,0x000b,0x000c,0x000d,0x000e,0x000f,
-	0x0010,0x0011,0x0012,0x0013,0x0014,0x0015,0x0016,0x0017,0x0018,0x0019,0x001a,0x001b,0x001c,0x001d,0x001e,0x001f,
-	0x0020,0x0021,0x0022,0x0023,0x0024,0x0025,0x0026,0x0027,0x0028,0x0029,0x002a,0x002b,0x002c,0x002d,0x002e,0x002f,
-	0x0030,0x0031,0x0032,0x0033,0x0034,0x0035,0x0036,0x0037,0x0038,0x0039,0x003a,0x003b,0x003c,0x003d,0x003e,0x003f,
-	0x0040,0x0041,0x0042,0x0043,0x0044,0x0045,0x0046,0x0047,0x0048,0x0049,0x004a,0x004b,0x004c,0x004d,0x004e,0x004f,
-	0x0050,0x0051,0x0052,0x0053,0x0054,0x0055,0x0056,0x0057,0x0058,0x0059,0x005a,0x005b,0x005c,0x005d,0x005e,0x005f,
-	0x0060,0x0061,0x0062,0x0063,0x0064,0x0065,0x0066,0x0067,0x0068,0x0069,0x006a,0x006b,0x006c,0x006d,0x006e,0x006f,
-	0x0070,0x0071,0x0072,0x0073,0x0074,0x0075,0x0076,0x0077,0x0078,0x0079,0x007a,0x007b,0x007c,0x007d,0x007e,0x007f,
-	0x0080,0x0081,0x0082,0x0083,0x0084,0x0085,0x0086,0x0087,0x0088,0x0089,0x008a,0x008b,0x008c,0x008d,0x008e,0x008f,
-	0x0090,0x0091,0x0092,0x0093,0x0094,0x0095,0x0096,0x0097,0x0098,0x0099,0x009a,0x009b,0x009c,0x009d,0x009e,0x009f,
-	0x00a0,0x00a1,0x00a2,0x00a3,0x00a4,0x00a5,0x00a6,0x00a7,0x00a8,0x00a9,0x00aa,0x00ab,0x00ac,0x00ad,0x00ae,0x00af,
-	0x00b0,0x00b1,0x00b2,0x00b3,0x00b4,0x00b5,0x00b6,0x00b7,0x00b8,0x00b9,0x00ba,0x00bb,0x00bc,0x00bd,0x00be,0x00bf,
-	0x00c0,0x00c1,0x00c2,0x00c3,0x00c4,0x00c5,0x00c6,0x00c7,0x00c8,0x00c9,0x00ca,0x00cb,0x00cc,0x00cd,0x00ce,0x00cf,
-	0x00d0,0x00d1,0x00d2,0x00d3,0x00d4,0x00d5,0x00d6,0x00d7,0x00d8,0x00d9,0x00da,0x00db,0x00dc,0x00dd,0x00de,0x00df,
-	0x00e0,0x00e1,0x00e2,0x00e3,0x00e4,0x00e5,0x00e6,0x00e7,0x00e8,0x00e9,0x00ea,0x00eb,0x00ec,0x00ed,0x00ee,0x00ef,
-	0x00f0,0x00f1,0x00f2,0x00f3,0x00f4,0x00f5,0x00f6,0x00f7,0x00f8,0x00f9,0x00fa,0x00fb,0x00fc,0x00fd,0x00fe,0x00ff
-};
-*/
+	0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
+	0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017, 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
+	0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
+	0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
+	0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
+	0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
+	0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067, 0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
+	0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077, 0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x007f,
+	0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087, 0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
+	0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097, 0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
+	0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7, 0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
+	0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7, 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
+	0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
+	0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7, 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
+	0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7, 0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
+	0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7, 0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff};
 
 inline constexpr char32_t CharsetTableISO8859_15[256] = {
 	0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
@@ -226,6 +224,60 @@
 }
 
 template <typename Tsrcstring>
+inline mpt::widestring decode_8bit_no_c1(const Tsrcstring & str, const char32_t (&table)[256], mpt::widechar replacement = MPT_WIDECHAR('\uFFFD')) {
+	mpt::widestring res;
+	res.reserve(str.length());
+	for (std::size_t i = 0; i < str.length(); ++i) {
+		std::size_t c = static_cast<std::size_t>(mpt::char_value(str[i]));
+		if ((0x80 <= c) && (c <= 0x9f)) {
+			res.push_back(replacement);
+		} else if (c < std::size(table)) {
+			res.push_back(static_cast<mpt::widechar>(table[c]));
+		} else {
+			res.push_back(replacement);
+		}
+	}
+	return res;
+}
+
+template <typename Tdststring>
+inline Tdststring encode_8bit_no_c1(const mpt::widestring & str, const char32_t (&table)[256], char replacement = '?') {
+	Tdststring res;
+	res.reserve(str.length());
+	for (std::size_t i = 0; i < str.length(); ++i) {
+		char32_t c = static_cast<char32_t>(str[i]);
+		bool found = false;
+		// Try non-control characters first.
+		// In cases where there are actual characters mirrored in this range (like in AMS/AMS2 character sets),
+		// characters in the common range are preferred this way.
+		for (std::size_t x = 0x20; x < std::size(table); ++x) {
+			if ((0x80 <= c) && (c <= 0x9f)) {
+				continue;
+			}
+			if (c == table[x]) {
+				res.push_back(static_cast<typename Tdststring::value_type>(static_cast<uint8>(x)));
+				found = true;
+				break;
+			}
+		}
+		if (!found) {
+			// try control characters
+			for (std::size_t x = 0x00; x < std::size(table) && x < 0x20; ++x) {
+				if (c == table[x]) {
+					res.push_back(static_cast<typename Tdststring::value_type>(static_cast<uint8>(x)));
+					found = true;
+					break;
+				}
+			}
+		}
+		if (!found) {
+			res.push_back(replacement);
+		}
+	}
+	return res;
+}
+
+template <typename Tsrcstring>
 inline mpt::widestring decode_ascii(const Tsrcstring & str, mpt::widechar replacement = MPT_WIDECHAR('\uFFFD')) {
 	mpt::widestring res;
 	res.reserve(str.length());
@@ -516,6 +568,15 @@
 		case common_encoding::riscos:
 			result = false;
 			break;
+		case common_encoding::iso8859_1_no_c1:
+			result = false;
+			break;
+		case common_encoding::iso8859_15_no_c1:
+			result = false;
+			break;
+		case common_encoding::amiga_no_c1:
+			result = false;
+			break;
 	}
 	return result;
 }
@@ -576,6 +637,15 @@
 		case common_encoding::riscos:
 			throw std::domain_error("unsupported encoding");
 			break;
+		case common_encoding::iso8859_1_no_c1:
+			throw std::domain_error("unsupported encoding");
+			break;
+		case common_encoding::iso8859_15_no_c1:
+			throw std::domain_error("unsupported encoding");
+			break;
+		case common_encoding::amiga_no_c1:
+			throw std::domain_error("unsupported encoding");
+			break;
 	}
 	return result;
 }
@@ -885,6 +955,15 @@
 		case common_encoding::riscos:
 			return encode_8bit<Tdststring>(src, CharsetTableRISC_OS);
 			break;
+		case common_encoding::iso8859_1_no_c1:
+			return encode_8bit_no_c1<Tdststring>(src, CharsetTableISO8859_1);
+			break;
+		case common_encoding::iso8859_15_no_c1:
+			return encode_8bit_no_c1<Tdststring>(src, CharsetTableISO8859_15);
+			break;
+		case common_encoding::amiga_no_c1:
+			return encode_8bit_no_c1<Tdststring>(src, CharsetTableAmiga);
+			break;
 	}
 	throw std::domain_error("unsupported encoding");
 }
@@ -985,6 +1064,15 @@
 		case common_encoding::riscos:
 			return decode_8bit(src, CharsetTableRISC_OS);
 			break;
+		case common_encoding::iso8859_1_no_c1:
+			return decode_8bit_no_c1(src, CharsetTableISO8859_1);
+			break;
+		case common_encoding::iso8859_15_no_c1:
+			return decode_8bit_no_c1(src, CharsetTableISO8859_15);
+			break;
+		case common_encoding::amiga_no_c1:
+			return decode_8bit_no_c1(src, CharsetTableAmiga);
+			break;
 	}
 	throw std::domain_error("unsupported encoding");
 }
