diff --git a/launcher/innoextract.cpp b/launcher/innoextract.cpp
index e4c40c00a..d3787fa04 100644
--- a/launcher/innoextract.cpp
+++ b/launcher/innoextract.cpp
@@ -60,3 +60,76 @@ QString Innoextract::extract(QString installer, QString outDir, std::function<vo
 
 	return errorText;
 }
+
+QString Innoextract::getHashError(QFile exe, std::optional<QFile> bin)
+{
+	enum filetype
+	{
+		H3_COMPLETE,
+		CHR1,
+		CHR2,
+		CHR3,
+		CHR4,
+		CHR5,
+		CHR6,
+		CHR7,
+		CHR8
+	};
+	struct data
+	{
+		filetype type;
+		std::string language;
+		int exeSize;
+		int binSize;
+		std::string exe;
+		std::string bin;
+	};
+	
+	std::vector<data> knownHashes = {
+		{ H3_COMPLETE, "english",    822520, 1005040617, "66646a353b06417fa12c6384405688c84a315cc1", "c624e2071f4e35386765ab044ad5860ac245b7f4" }, // setup_heroes_of_might_and_magic_3_complete_4.0_(28740).exe
+		{ H3_COMPLETE, "french",     824960,  997305870, "072f1d4466ff16444d8c7949c6530448a9c53cfa", "9b6b451d2bd2f8b4be159e62fa6d32e87ee10455" }, // setup_heroes_of_might_and_magic_3_complete_4.0_(french)_(28740).exe
+		{ H3_COMPLETE, "polish",     822288,  849286313, "74ffde00156dd5a8e237668f87213387f0dd9c7c", "2523cf9943043ae100186f89e4ebf7c28be09804" }, // setup_heroes_of_might_and_magic_3_complete_4.0_(polish)_(28740).exe
+		{ H3_COMPLETE, "russian",    821608,  980398466, "88ccae41e66da58ba4ad62024d97dfe69084f825", "58f1b3c813a1953992bba1f9855c47d01c897db8" }, // setup_heroes_of_might_and_magic_3_complete_4.0_(russian)_(28740).exe
+		{ H3_COMPLETE, "english",    820288, 1006275333, "ca68adb8c2d8c6b3afa17a595ad70c2cec062b5a", "2715e10e91919d05377d39fd879d43f9f0cb9f87" }, // setup_heroes_of_might_and_magic_3_complete_4.0_(3.2)_gog_0.1_(77075).exe
+		{ H3_COMPLETE, "french",     822688,  998540653, "fbb300eeef52f5d81a571a178723b19313e3856d", "4f4d90ff2f60968616766237664744bc54754500" }, // setup_heroes_of_might_and_magic_3_complete_4.0_(3.2)_gog_0.1_(french)_(77075).exe
+		{ H3_COMPLETE, "polish",     819904,  851750601, "a413b0b9f3d5ca3e1a57e84a42de28c67d77b1a7", "fd9fe58bcbb8b442e8cfc299d90f1d503f281d40" }, // setup_heroes_of_might_and_magic_3_complete_4.0_(3.2)_gog_0.1_(polish)_(77075).exe
+		{ H3_COMPLETE, "russian",    819416,  981633128, "e84eedf62fe2e5f9171a7e1ce6e99315a09ce41f", "49cc683395c0cf80830bfa66e42bb5dfdb7aa124" }, // setup_heroes_of_might_and_magic_3_complete_4.0_(3.2)_gog_0.1_(russian)_(77075).exe
+		{ CHR1,        "english", 485694752,          0, "44e4fc2c38261a1c2a57d5198f44493210e8fc1a", ""                                         }, // setup_heroes_chronicles_chapter1_2.1.0.42.exe
+		{ CHR2,        "english", 493102840,          0, "b479a3272cf4b57a6b7fc499df5eafb624dcd6de", ""                                         }, // setup_heroes_chronicles_chapter2_2.1.0.43.exe
+		{ CHR3,        "english", 470364128,          0, "5ad36d822e1700c9ecf93b78652900a52518146b", ""                                         }, // setup_heroes_chronicles_chapter3_2.1.0.41.exe
+		{ CHR4,        "english", 469211296,          0, "5deb374a2e188ed14e8f74ad1284c45e46adf760", ""                                         }, // setup_heroes_chronicles_chapter4_2.1.0.42.exe
+		{ CHR5,        "english", 447497560,          0, "a6daa6ed56c840f3be7ad6ad920a2f9f2439acc8", ""                                         }, // setup_heroes_chronicles_chapter5_2.1.0.42.exe
+		{ CHR6,        "english", 447430456,          0, "93a42dd24453f36e7020afc61bca05b8461a3f04", ""                                         }, // setup_heroes_chronicles_chapter6_2.1.0.42.exe
+		{ CHR7,        "english", 481583720,          0, "d74b042015f3c5b667821c5d721ac3d2fdbf43fc", ""                                         }, // setup_heroes_chronicles_chapter7_2.1.0.42.exe
+		{ CHR8,        "english", 462976008,          0, "9039050e88b9dabcdb3ffa74b33e6aa86a20b7d9", ""                                         }, // setup_heroes_chronicles_chapter8_2.1.0.42.exe
+	};
+
+	std::string exeHash;
+	std::string binHash;
+
+	if(exe.open(QFile::ReadOnly)) {
+        QCryptographicHash hash(QCryptographicHash::Algorithm::Sha1);
+        if(hash.addData(&exe)) {
+            exeHash = hash.result().toHex().toLower().toStdString();
+        }
+    }
+	else
+		return QString{}; // reading problem
+	if(bin)
+	{
+		if((*bin).open(QFile::ReadOnly)) {
+			QCryptographicHash hash(QCryptographicHash::Algorithm::Sha1);
+			if(hash.addData(&(*bin))) {
+				binHash = hash.result().toHex().toLower().toStdString();
+			}
+		}
+		else
+			return QString{}; // reading problem
+	}
+	
+	QString hashOutput = tr("Hash:\n") + tr("Exe: ") + QString::fromStdString(exeHash);
+	if(!binHash.empty())
+		hashOutput += "\n" + tr("Bin: ") + QString::fromStdString(binHash);
+
+	return tr("Unknown files:\n\n") + hashOutput;
+}
diff --git a/launcher/innoextract.h b/launcher/innoextract.h
index 4e5ee0a10..adc7b3e06 100644
--- a/launcher/innoextract.h
+++ b/launcher/innoextract.h
@@ -13,4 +13,5 @@ class Innoextract : public QObject
 {
 public:
 	static QString extract(QString installer, QString outDir, std::function<void (float percent)> cb = nullptr);
+	QString getHashError(QFile exe, std::optional<QFile> bin);
 };