diff --git a/aegisub/src/dialog_style_manager.cpp b/aegisub/src/dialog_style_manager.cpp
index 4eb5e783e..5a285b0ec 100644
--- a/aegisub/src/dialog_style_manager.cpp
+++ b/aegisub/src/dialog_style_manager.cpp
@@ -583,7 +583,7 @@ void DialogStyleManager::OnCurrentImport() {
 
 	AssFile temp;
 	try {
-		auto reader = SubtitleFormat::GetReader(filename);
+		auto reader = SubtitleFormat::GetReader(filename, charset);
 		if (!reader)
 			wxMessageBox("Unsupported subtitle format", "Error", wxOK | wxICON_ERROR | wxCENTER, this);
 		else
diff --git a/aegisub/src/subs_controller.cpp b/aegisub/src/subs_controller.cpp
index 9f8e69a9f..2cfa237a0 100644
--- a/aegisub/src/subs_controller.cpp
+++ b/aegisub/src/subs_controller.cpp
@@ -107,7 +107,7 @@ void SubsController::Load(agi::fs::path const& filename, std::string charset) {
 		}
 	}
 
-	const SubtitleFormat *reader = SubtitleFormat::GetReader(filename);
+	const SubtitleFormat *reader = SubtitleFormat::GetReader(filename, charset);
 
 	try {
 		AssFile temp;
diff --git a/aegisub/src/subtitle_format.cpp b/aegisub/src/subtitle_format.cpp
index 48b227609..d5f6f9fc2 100644
--- a/aegisub/src/subtitle_format.cpp
+++ b/aegisub/src/subtitle_format.cpp
@@ -76,7 +76,7 @@ SubtitleFormat::~SubtitleFormat() {
 	formats.erase(remove(begin(formats), end(formats), this));
 }
 
-bool SubtitleFormat::CanReadFile(agi::fs::path const& filename) const {
+bool SubtitleFormat::CanReadFile(agi::fs::path const& filename, std::string const&) const {
 	auto wildcards = GetReadWildcards();
 	return any_of(begin(wildcards), end(wildcards),
 		[&](std::string const& ext) { return agi::fs::HasExtension(filename, ext); });
@@ -335,9 +335,9 @@ SubtitleFormat *find_or_throw(Cont &container, Pred pred) {
 	return *it;
 }
 
-const SubtitleFormat *SubtitleFormat::GetReader(agi::fs::path const& filename) {
+const SubtitleFormat *SubtitleFormat::GetReader(agi::fs::path const& filename, std::string const& encoding) {
 	LoadFormats();
-	return find_or_throw(formats, std::bind(&SubtitleFormat::CanReadFile, _1, filename));
+	return find_or_throw(formats, std::bind(&SubtitleFormat::CanReadFile, _1, filename, encoding));
 }
 
 const SubtitleFormat *SubtitleFormat::GetWriter(agi::fs::path const& filename) {
diff --git a/aegisub/src/subtitle_format.h b/aegisub/src/subtitle_format.h
index 7f0a1ed32..02ba14dae 100644
--- a/aegisub/src/subtitle_format.h
+++ b/aegisub/src/subtitle_format.h
@@ -93,7 +93,7 @@ public:
 	///
 	/// Default implementation simply checks if the file's extension is in the
 	/// format's wildcard list
-	virtual bool CanReadFile(agi::fs::path const& filename) const;
+	virtual bool CanReadFile(agi::fs::path const& filename, std::string const& encoding) const;
 
 	/// @brief Check if the given file can be written by this format
 	///
@@ -124,7 +124,7 @@ public:
 	static std::string GetWildcards(int mode);
 
 	/// Get a subtitle format that can read the given file or nullptr if none can
-	static const SubtitleFormat *GetReader(agi::fs::path const& filename);
+	static const SubtitleFormat *GetReader(agi::fs::path const& filename, std::string const& encoding);
 	/// Get a subtitle format that can write the given file or nullptr if none can
 	static const SubtitleFormat *GetWriter(agi::fs::path const& filename);
 	/// Initialize subtitle formats
diff --git a/aegisub/src/subtitle_format_microdvd.cpp b/aegisub/src/subtitle_format_microdvd.cpp
index 6db8f0886..3733874d7 100644
--- a/aegisub/src/subtitle_format_microdvd.cpp
+++ b/aegisub/src/subtitle_format_microdvd.cpp
@@ -39,7 +39,6 @@
 #include "ass_dialogue.h"
 #include "ass_file.h"
 #include "ass_time.h"
-#include "charset_detect.h"
 #include "text_file_reader.h"
 #include "text_file_writer.h"
 #include "video_context.h"
@@ -70,14 +69,11 @@ std::vector<std::string> MicroDVDSubtitleFormat::GetWriteWildcards() const {
 
 static const boost::regex line_regex("^[\\{\\[]([0-9]+)[\\}\\]][\\{\\[]([0-9]+)[\\}\\]](.*)$");
 
-bool MicroDVDSubtitleFormat::CanReadFile(agi::fs::path const& filename) const {
+bool MicroDVDSubtitleFormat::CanReadFile(agi::fs::path const& filename, std::string const& encoding) const {
 	// Return false immediately if extension is wrong
 	if (!agi::fs::HasExtension(filename, "sub")) return false;
 
 	// Since there is an infinity of .sub formats, load first line and check if it's valid
-	auto encoding = CharSetDetect::GetEncoding(filename);
-	if (encoding == "binary") return false;
-
 	TextFileReader file(filename, encoding);
 	if (file.HasMoreLines())
 		return regex_match(file.ReadLineFromFile(), line_regex);
diff --git a/aegisub/src/subtitle_format_microdvd.h b/aegisub/src/subtitle_format_microdvd.h
index 96fc4017a..b8ad7c51f 100644
--- a/aegisub/src/subtitle_format_microdvd.h
+++ b/aegisub/src/subtitle_format_microdvd.h
@@ -41,7 +41,7 @@ public:
 	std::vector<std::string> GetReadWildcards() const override;
 	std::vector<std::string> GetWriteWildcards() const override;
 
-	bool CanReadFile(agi::fs::path const& filename) const override;
+	bool CanReadFile(agi::fs::path const& filename, std::string const& encoding) const override;
 	void ReadFile(AssFile *target, agi::fs::path const& filename, std::string const& forceEncoding) const override;
 
 	void WriteFile(const AssFile *src, agi::fs::path const& filename, std::string const& encoding) const override;