diff --git a/CHANGELOG b/CHANGELOG
index ca5d4e5b80..86dcf2bab3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,5 @@
 NEXT
+  - Allow the ".inst" extension for CUE sheets. (Allofich)
   - Add SET /FIRST, a DOSBox-X extension, that takes the specified
     variable if it exists and moves it to the front of the environment
     block. (joncampbell123).
diff --git a/src/dos/cdrom_image.cpp b/src/dos/cdrom_image.cpp
index d70dff686c..8daa4ebc81 100644
--- a/src/dos/cdrom_image.cpp
+++ b/src/dos/cdrom_image.cpp
@@ -1302,7 +1302,7 @@ bool CDROM_Interface_Image::LoadCueSheet(char *cuefile)
 	{
 		char *s = strrchr(cuefile,'.');
 		if (!s) return false;
-		if (!strcasecmp(s,".ccd") || !strcasecmp(s, ".chd") || !strcasecmp(s, ".iso") || !strcasecmp(s, ".img")
+		if (!strcasecmp(s,".ccd") || !strcasecmp(s, ".chd") || !strcasecmp(s, ".iso") || !strcasecmp(s, ".img") || !strcasecmp(s, ".gog")
             || !strcasecmp(s, ".mds") || !strcasecmp(s, ".mdf") || !strcasecmp(s, ".bin")) return false;
 	}
 
diff --git a/src/dos/dos_programs.cpp b/src/dos/dos_programs.cpp
index 4bc26b0d84..ec506eb029 100644
--- a/src/dos/dos_programs.cpp
+++ b/src/dos/dos_programs.cpp
@@ -549,8 +549,8 @@ void MenuBrowseCDImage(char drive, int num) {
     getcwd(Temp_CurrentDir, 512);
     char const * lTheOpenFileName;
     std::string files="", fname="";
-    const char *lFilterPatterns[] = {"*.iso","*.cue","*.bin","*.chd","*.mdf","*.gog","*.ins","*.ISO","*.CUE","*.BIN","*.CHD","*.MDF","*.GOG","*.INS"};
-    const char *lFilterDescription = "CD image files (*.iso, *.cue, *.bin, *.chd, *.mdf, *.gog, *.ins)";
+    const char *lFilterPatterns[] = {"*.iso","*.cue","*.bin","*.chd","*.mdf","*.gog","*.ins","*.inst","*.ISO","*.CUE","*.BIN","*.CHD","*.MDF","*.GOG","*.INS","*.INST" };
+    const char *lFilterDescription = "CD image files (*.iso, *.cue, *.bin, *.chd, *.mdf, *.gog, *.ins, *.inst)";
     lTheOpenFileName = tinyfd_openFileDialog("Select a CD image file","", sizeof(lFilterPatterns) / sizeof(lFilterPatterns[0]),lFilterPatterns,lFilterDescription,0);
 
     if (lTheOpenFileName) {
@@ -657,7 +657,7 @@ void MenuBrowseImageFile(char drive, bool arc, bool boot, bool multiple) {
         lTheOpenFileName = tinyfd_openFileDialog(("Select an archive file for Drive "+str+":").c_str(),"", sizeof(lFilterPatterns) / sizeof(lFilterPatterns[0]),lFilterPatterns,lFilterDescription,0);
         if (lTheOpenFileName) fname = GetNewStr(lTheOpenFileName);
     } else {
-        const char *lFilterPatterns[] = {"*.ima","*.img","*.vhd","*.fdi","*.hdi","*.nfd","*.nhd","*.d88","*.hdm","*.xdf","*.iso","*.cue","*.bin","*.chd","*.mdf","*.gog","*.ins","*.ccd","*.IMA","*.IMG","*.VHD","*.FDI","*.HDI","*.NFD","*.NHD","*.D88","*.HDM","*.XDF","*.ISO","*.CUE","*.BIN","*.CHD","*.MDF","*.GOG","*.INS", "*.CCD"};
+        const char *lFilterPatterns[] = {"*.ima","*.img","*.vhd","*.fdi","*.hdi","*.nfd","*.nhd","*.d88","*.hdm","*.xdf","*.iso","*.cue","*.bin","*.chd","*.mdf","*.gog","*.ins","*.ccd","*.inst","*.IMA","*.IMG","*.VHD","*.FDI","*.HDI","*.NFD","*.NHD","*.D88","*.HDM","*.XDF","*.ISO","*.CUE","*.BIN","*.CHD","*.MDF","*.GOG","*.INS","*.CCD","*.INST"};
         const char *lFilterDescription = "Disk/CD image files";
         lTheOpenFileName = tinyfd_openFileDialog(((multiple?"Select image file(s) for Drive ":"Select an image file for Drive ")+str+":").c_str(),"", sizeof(lFilterPatterns) / sizeof(lFilterPatterns[0]),lFilterPatterns,lFilterDescription,multiple?1:0);
         if (lTheOpenFileName) fname = GetNewStr(lTheOpenFileName);
@@ -687,7 +687,7 @@ void MenuBrowseImageFile(char drive, bool arc, bool boot, bool multiple) {
                 strcpy(ext, fname.substr(fname.size()-4).c_str());
             if(!strcasecmp(ext,".ima"))
                 strcpy(type,"-t floppy ");
-            else if((!strcasecmp(ext,".iso")) || (!strcasecmp(ext,".cue")) || (!strcasecmp(ext,".bin")) || (!strcasecmp(ext,".chd")) || (!strcasecmp(ext,".mdf")) || (!strcasecmp(ext,".gog")) || (!strcasecmp(ext,".ins")))
+            else if((!strcasecmp(ext,".iso")) || (!strcasecmp(ext,".cue")) || (!strcasecmp(ext,".bin")) || (!strcasecmp(ext,".chd")) || (!strcasecmp(ext,".mdf")) || (!strcasecmp(ext,".gog")) || (!strcasecmp(ext,".ins")) || (!strcasecmp(ext, ".inst")))
                 strcpy(type,"-t iso ");
             else
                 strcpy(type,"");
@@ -5463,7 +5463,7 @@ class IMGMOUNT : public Program {
 				if (!rtype&&!rfstype&&fstype!="none"&&paths[0].length()>4) {
 					const char *ext = strrchr(paths[0].c_str(), '.');
 					if (ext != NULL) {
-                        if (!strcasecmp(ext, ".iso")||!strcasecmp(ext, ".cue")||!strcasecmp(ext, ".bin")||!strcasecmp(ext, ".chd")||!strcasecmp(ext, ".mdf")||!strcasecmp(ext, ".gog")||!strcasecmp(ext, ".ins")||!strcasecmp(ext, ".ccd")) {
+                        if (!strcasecmp(ext, ".iso")||!strcasecmp(ext, ".cue")||!strcasecmp(ext, ".bin")||!strcasecmp(ext, ".chd")||!strcasecmp(ext, ".mdf")||!strcasecmp(ext, ".gog")||!strcasecmp(ext, ".ins")||!strcasecmp(ext, ".ccd")||!strcasecmp(ext, ".inst")) {
                             type="iso";
                             fstype="iso";
                             if(ide_index < 0 || ideattach == "auto") {